Online Encyclopedia
80 (number)
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Cardinal | eighty | ||
Ordinal | 80th (eightieth) | ||
Numeral system | octagesimal | ||
Factorization | |||
Divisors | 2, 4, 5, 8, 10, 16, 20, 40 | ||
Roman numeral | LXXX | ||
Binary | 01010000 | ||
Hexadecimal | 50 |
80 is the natural number following 79 and preceding 81. It is a Harshad number.
- Greek numeral: π´
- See wiktionary:eighty to see 80 in other languages.
Eighty is also:
- the atomic number of mercury (Hg)
- 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
- the model number of the computers TRS-80, IBM 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 and Eighty Proof Soul
- the age limit for cardinals to vote in papal elections
- the percentage of work done with 20% of the resources according to a "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 Jersey; the European route E80 from Lisbon to Gürbulak
- the standard TCP/IP port number for HTTP connection
- 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.
- The year AD 80, 80 BC, or 1980.
Last updated: 03-01-2005 15:05:38