73 (number)

73 is the natural number following 72 and preceding 74.

List of numbersIntegers

<< 70 71 72 73 74 75 76 77 78 79 >>

Cardinal seventy-three
Ordinal73rd (seventy-third)
Factorization<math>prime<math>
Roman numeralLXXIII
Binary1001001
Hexadecimal49

In mathematics

Seventy-three is the 21st prime number. The previous is seventy-one, with which it comprises a twin prime. It is also a permutable prime with thirty-seven. 73 is a star number.

Every positive integer is the sum of at most 73 sixth powers (see Waring's problem).

In science

In astronomy,

Messier object M73, a magnitude 9.0 apparent open cluster in the constellation Aquarius
The New General Catalogue object (http://www.ngcic.org/) NGC 73, a barred spiral galaxy in the constellation Cetus
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -716 July 16 and ended on 582 September 3. The duration of Saros series 73 was 1298.1 years, and it contained 73 solar eclipses.
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -378 May 16 and ended on 902 June 23. The duration of Saros series 73 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

Seventy-three is also:

es:Setenta y tres

ko:73 ia:73 it:Settantatré ja:73 sl:73 (število) sv:73 (tal) zh:73

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