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From Wikipedia, the free encyclopedia

50 (fifty) is the natural number following 49 and preceding 51.

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In mathematics

Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 12 + 72 = 52 + 52.[1] It is also the sum of three squares, 50 = 32 + 42 + 52, and the sum of four squares, 50 = 62 + 32 + 22 + 12. It is a Harshad number.[2]

There is no solution to the equation φ(x) = 50, making 50 a nontotient.[3] Nor is there a solution to the equation x − φ(x) = 50, making 50 a noncototient.[4]

In science

In religion

In sports

In other fields

Fifty is:

  • There are 50 states in the United States of America. The TV show Hawaii Five-O and its reimagined version, Hawaii Five-0, are so called because Hawaii is the last (50th) of the states to officially become a state.
  • 5-O (Five-Oh) - Slang for police officers and/or a warning that police are approaching. Derived from the television show Hawaii Five-O[7]
  • A calibre of ammunition (0.50 inches: see .50 BMG)
  • In millimetres, the focal length of the normal lens in 35 mm photography
  • The percentage (50%) equivalent to one half, so that the phrase "fifty-fifty" commonly expresses something divided equally in two; in business this is often denoted as being the ultimate in equal partnership
  • In years of marriage, the gold or "golden" wedding anniversary
  • Nickname 50 Cent, a rapper.
  • A Canadian brand of beer called 50 Ale created in 1950 by Labatt breweries to commemorate 50 years of partnership. It is a popular brand still sold today.
  • The speed limit, in kilometres per hour, of Australian and Canadian roads with unspecified limits.
  • In the 1994 action movie Speed, which depicts a Los Angeles cop (Keanu Reeves), who must rescue civilians on a bus that has a bomb rigged to it which will detonate if the bus's speed drops below 50 mph.


  1. ^ de Koninck, J.M. (2009). Those fascinating numbers. AMS Bookstore. p. 18. ISBN 0-8218-4807-0.
  2. ^ "Sloane's A005349 : Niven (or Harshad) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  3. ^ "Sloane's A005277 : Nonients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  4. ^ "Sloane's A005278 : Noncotients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  5. ^ Adkison, Linda (2011). Elsevier's Integrated Review Genetics. p. 42.
  6. ^ Leviticus 25:10
  7. ^ Karen Rhodes (1 February 1997). Booking Hawaii Five-O: An Episode Guide and Critical History of the 1968–1980 Television Detective Series. McFarland. p. 265. ISBN 978-0-7864-8666-3.
This page was last edited on 17 July 2019, at 01:14
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