80 (eighty) is the natural number following 79 and preceding 81. In Mathematics, a natural number (also called counting number) can mean either an element of the set (the positive Integers or an 79 ( seventy-nine) is the Natural number following 78 and preceding 80. 81 ( eighty-one) is the Natural number following 80 and preceding 82.
| Cardinal | 80 eighty |
| Ordinal | 80th eightieth |
| Factorization |  |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 |
| Roman numeral | LXXX |
| Roman numeral (Unicode) | LXXX, lxxx |
| Binary | 1010000 |
| Octal | 120 |
| Duodecimal | 68 |
| Hexadecimal | 50 |
| Greek numeral | π´ |
| Hebrew | פ (Pe) |
| Thai | ๘๐ |
Contents |
In mathematics
The sum of Euler's totient function φ(x) over the first sixteen integers is 80. 79 ( seventy-nine) is the Natural number following 78 and preceding 80. 81 ( eighty-one) is the Natural number following 80 and preceding 82. 82 ( eighty-two) is the Natural number following 81 and preceding 83. In mathematics Eighty-three is the sum of three consecutive primes (23 + 29 + 31 as well as the sum of five consecutive primes (11 + 13 + 17 + 19 + 23 84 ( eighty-four) is the Natural number following 83 and preceding 85. 85 ( eighty-five) is the Natural number following 84 and preceding 86. 86 ( eighty-six) is the Natural number following 85 and preceding 87. 87 ( eighty-seven) is the Natural number following 86 and preceding 88. 88 ( eighty-eight) is the Natural number following 87 and preceding 89. 89 ( eighty-nine) is the Natural number following 88 and preceding 90. 90 ( ninety) is the Natural number preceded by 89 and followed by 91. This is a list of articles about Numbers ( not about Numerals. The integers (from the Latin integer, literally "untouched" hence "whole" the word entire comes from the same origin but via French "Twenty" redirects here For the village in England, see Twenty Lincolnshire. 30 ( thirty) is the Natural number following 29 and preceding 31. 40 ( forty) is the Natural number following 39 and preceding 41. This article discusses the number fifty. For the year 50 CE see 50. 60 ( sixty) is the Natural number following 59 and preceding 61. 70 ( seventy) is the Natural number following 69 and preceding 71. 90 ( ninety) is the Natural number preceded by 89 and followed by 91. This article describes cardinal numbers in mathematics For cardinals in linguistics see Names of numbers in English. In Set theory, an ordinal number, or just ordinal, is the Order type of a Well-ordered set. In Mathematics, factorization ( also factorisation in British English) or factoring is the decomposition of an object (for In Mathematics, a divisor of an Integer n, also called a factor of n, is an integer which evenly divides n without Roman numerals are a Numeral system originating in ancient Rome, adapted from Etruscan numerals. The binary numeral system, or base-2 number system, is a Numeral system that represents numeric values using two symbols usually 0 and 1. The octal Numeral system, or oct for short is the base -8 number system and uses the digits 0 to 7 The duodecimal system (also known as base -12 or dozenal) is a Numeral system using twelve as its base. In Mathematics and Computer science, hexadecimal (also base -, hexa, or hex) is a Numeral system with a ʹ the numeral sign redirects here For the accent ´ see Acute accent. Thai numerals (เลขไทย are a set of numerals traditionally used in Thailand, although the Arabic numerals are more common In Number theory, the totient \varphi(n of a Positive integer n is defined to be the number of positive integers less than or equal to
Adding up some subsets of its divisors (e. g. , 1, 4, 5, 10, 20 and 40) gives 80, hence 80 is a semiperfect number. In Mathematics, a semiperfect number or pseudoperfect number is a Natural number n that is equal to the sum of all or some of its Proper
80 is a Harshad number number in base 10. A Harshad number, or Niven number, is an Integer that is divisible by the sum of its digits in a given number base. The decimal ( base ten or occasionally denary) Numeral system has ten as its base.
In astronomy
- Messier object M80, a magnitude 8. The Messier objects are a set of Astronomical objects first listed by French astronomer Charles Messier in his "Catalogue des Nébuleuses Messier 80 (also known as M80 or NGC 6093) is a Globular cluster in the Constellation Scorpius. The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 5 globular cluster in the constellation Scorpius
- The New General Catalogue object NGC 80, a magnitude 12. A globular cluster is a spherical collection of Stars that orbits a galactic core as a Satellite. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Scorpius ( Latin for Scorpion, symbol, Unicode ♏ is one of the Constellations of the Zodiac. The New General Catalogue ( NGC) is the best-known catalogue of Deep sky objects in Amateur astronomy. 1 spiral galaxy in the constellation Andromeda
- The Saros number of the solar eclipse series which began on 333 BC June 13 and ended on 929 July 9. A spiral galaxy is a Galaxy belonging to one of the three main classes of galaxy originally described by Edwin Hubble in his 1936 work “The Realm of the Andromeda ( is a Constellation named for the princess Andromeda ( Greek Ανδρομέδη = guardian of the men) a character in Saros or Sáros may refer to Saros cycle, a method for predicting solar eclipses SS Saros, a shipwreck off the southeast coast A solar eclipse occurs when the Moon passes between the Sun and the Earth so that the Sun is wholly or partially obscured Events By place Macedonia King Alexander of Macedonia conquers western Asia Minor, subduing the hill tribes of Events 1525 - Martin Luther marries Katharina von Bora, against the Celibacy rule decreed by the Roman Catholic Church for This article is about the year For the automobile see Mazda 929. Events 455 - Roman military commander Avitus is proclaimed Emperor of the Western Roman Empire. The duration of Saros series 80 was 1262. 1 years, and it contained 71 solar eclipses. Further, the Saros number of the lunar eclipse series which began on 121 BC January 27 and ended on 1213 April 6. A lunar eclipse occurs whenever the Moon passes through some portion of the Earth's shadow Events 98 - Trajan becomes Roman Emperor after the death of Nerva. Events 46 BC - Julius Caesar defeats Caecilius Metellus Scipio and Marcus Porcius Cato in the Battle of Thapsus The duration of Saros series 80 was 1334. 2 years, and it contained 75 lunar eclipses.
In other fields
Eighty is also:
- The number worn by professional football player Jerry Rice. Jerry Lee Rice (born October 13, 1962 in Crawford Mississippi) is a former football Wide receiver in the NFL.
- The atomic number of mercury
- A cross-country interstate in the United States
- Iowa 80 truck stop, the world's largest truck stop
- the number of units in a fourscore
- the age at which one becomes an octogenarian
- in the title of Around the World in Eighty Days by Jules Verne
- in the title of the film "Star 80" (1983) starring Mariel Hemingway
- in the title of the film 80 Steps to Jonah (1969) starring Wayne Newton
- the model number of the computers TRS-80, Sinclair ZX80, and Aster CT-80
- the model number of:
- T-80, a Soviet tank
- IAR 80, a Romanian WWII fighter aircraft
- McDonnell Douglas MD-80, Arado Ar 80, and F-80 Shooting Star
- part of the name of the bands Eighty-D, Eighty Proof Soul and Element Eighty
- the upper age limit for cardinals to vote in papal elections
- the percentage of consequences that stem from 20% of the causes according to the "80-20 rule"
- the length of a beach in Western Australia: Eighty Mile Beach
- the length of the Eighty Years' War or Dutch revolt (1568-1648)
- the number of the French department Somme
- the designation of Interstate 80, a freeway that runs from California to New York; the European route E80 from Lisbon to Gürbulak
- the standard TCP/IP port number for HTTP connections
- the 80A, 80B and 80C photographic filters correct for excessive redness under tungsten lighting
- The ISBN Group Identifier for books published in the Czech Republic and Slovakia. See also List of elements by atomic number In Chemistry and Physics, the atomic number (also known as the proton Mercury (ˈmɜrkjʊri also called quicksilver or hydrargyrum, is a Chemical element with the symbol Hg ( Latinized hydrargyrum Interstate 80 (I-80 is the second-longest Interstate Highway in the United States (after I-90) The United States of America —commonly referred to as the Iowa 80 is the world's largest Truck stop, located along Interstate 80 off exit 284 in Walcott, Iowa. "Twenty" redirects here For the village in England, see Twenty Lincolnshire. Ageing or aging (American English is the accumulation of changes in an organism Around the World in Eighty Days (Le tour du monde en quatre-vingts jours is a classic Adventure novel by the French writer Jules Verne, first Jules Gabriel Verne ( February 8 1828 &ndash March 24 1905) was a French Author who pioneered the science-fiction Star 80 is a 1983 film about the true story of Playboy Playmate of the Year Dorothy Stratten, who was murdered by her estranged husband Year 1983 ( MCMLXXXIII) was a Common year starting on Saturday (link displays the 1983 Gregorian calendar) Mariel Hadley Hemingway (born November 22, 1961) is an Academy Award - and Golden Globe -nominated American actress. Carson Wayne Newton' (born April 3, 1942) is an American Singer and entertainer based in Las Vegas Nevada. TRS-80 was Tandy Corporation 's desktop Microcomputer model line sold through Tandy's Radio Shack stores in the late 1970s and early The Sinclair ZX80 was a Home computer brought to market in 1980 by Sinclair Research of Cambridge England The Aster CT-80, an early home / Personal computer developed by the small Dutch company MCP (later renamed to Aster Computers) was sold in its The T-80 is a Main battle tank which was designed in the Soviet Union and entered service in 1976 The IAR 80 was a Romanian World War II low-wing Monoplane, all-metal construction Fighter aircraft. The Arado Ar 80 was a pre- World War II Fighter aircraft, designed by Arado Flugzeugwerke to compete for the Luftwaffe 's first major fighter contract WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout Element Eighty is a four-piece metal band from Tyler, Texas. The band formed in 1995 Ageing or aging (American English is the accumulation of changes in an organism A cardinal is a senior ecclesiastical official usually a bishop, of the Catholic Church. A papal conclave is a meeting of the College of Cardinals to elect the Pope (or Bishop of Rome) who is considered by Catholics to be the Successor The Pareto principle (also known as the 80-20 rule, the law of the vital few and the principle of factor sparsity) states that for many events 80% Eighty Mile Beach is located almost half way between the West Australian towns of Broome and Port Hedland. The Dutch Revolt, Eighty Years' War or the Revolt of the Netherlands (1568—1648 was the revolt of the Seventeen Provinces in the Low Countries In the context of the political and geographic organization of France and many of its former colonies a department (département depaʁtǝmɑ̃ is an Administrative division The Somme is a department of France, located in the north of the country and named after the Somme river. Interstate 80 (I-80 is the second-longest Interstate Highway in the United States (after I-90) California ( is a US state on the West Coast of the United States, along the Pacific Ocean. New York ( is a state in the Mid-Atlantic and Northeastern regions of the United States and is the nation's third most populous The international E-road network is a numbering system for Roads in Europe developed by the United Nations Economic Commission for Europe (UNECE. European route E80 is a road part of the International E-road network. Lisbon (Lisboa liʒˈboɐ is the Capital and largest city of Portugal. Gürbulak is a village in east Turkey in the district Doğubeyazıt of province Ağrı, close to the border with Iran. The Internet Protocol Suite (commonly TCP/IP) is the set of Communications protocols used for the Internet and other similar networks In Computer networking, a port is an application-specific or process-specific software construct serving as a communications endpoint used by Transport Layer protocols Hypertext Transfer Protocol ( HTTP) is a Communications protocol for the transfer of information on the Internet. In Photography, a filter is a Camera accessory consisting of an optical filter that can be inserted in the optical path Tungsten (ˈtʌŋstən also known as wolfram (/ˈwʊlfrəm/ is a Chemical element that has the symbol W and Atomic number 74 The Czech Republic ( ˈt͡ʃɛskaː ˈrɛpuˌblɪka short form in Česko ˈt͡ʃɛskɔ also called Czechia, Slovakia (long form Slovak Republic; Slovak:, long form, is a Landlocked country in Central Europe with a population of over five million
- The year AD 80, 80 BC, or 1980. Year 80 was a Leap year starting on Saturday (link will display the full calendar of the Julian calendar. Year 80 BC was a year of the pre-Julian calendar. Events By place Rome Battle of the Baetis River — Democratic rebel Year 1980 ( MCMLXXX) was a Leap year starting on Tuesday (link displays the 1980 Gregorian calendar)
- The Audi 80, the predecessor to the Audi A4. The Audi 80 is a Compact executive car produced by the German car manufacturer Audi, from 1966 to 1996 The Audi A4 is a Compact executive car produced by the German automaker Audi since 1994
- The title of the 8th track on Green Day's second full length album Kerplunk!
- The highest score possible on each of the three sections of the PSAT
- Eighty shilling ale
- According to Exodus 7:7, Moses was 80 years old when he initially spoke to Pharaoh on behalf of his people. Green Day is an American rock trio Kerplunk (also known as Kerplunk!) is the second full-length album by Punk rock band Green Day. The Preliminary SAT/National Merit Scholarship Qualifying Test is a multiple-choice Standardized test administered by the College Board and National Scottish cuisine is the specific set of cooking traditions and practices associated with Scotland.
External links
- wiktionary:eighty for 80 in other languages.
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