73 number

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73 is the natural number following 72 and preceding 74.

Template:Numbers 70s
Cardinal seventy-three
Ordinal73rd (seventy-third)
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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 NGC 73, a barred spiral galaxy in the constellation Cetus
The Saros number 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 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:

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es:Setenta y tres eo:Eo:Sepdek tri fr:73 (nombre) ko:73 ia:73 it:Settantatré ja:73 pt:Setenta e três ru:73 (число) sl:73 (število) sv:73 (tal) zh:73