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75 (Number)75 is the natural number following 74 and preceding 76. In mathematics As the sum of the first five pentagonal numbers, seventy-five is a pentagonal pyramidal number. It is also an enneagonal number. It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75... But there is no integer that added up to its own digits adds up to 75, hence 75 is a self number. There are 75 uniform polyhedra. In science In astronomy, - Messier object M75, a magnitude 9.5 globular cluster in the constellation Sagittarius
- The New General Catalogue object NGC 75, a spiral galaxy in the constellation Pisces
- The Saros number of the solar eclipse series which began on -604 July 7 and ended on 694 August 26. The duration of Saros series 75 was 1298.1 years, and it contained 73 solar eclipses.
- The Saros number of the lunar eclipse series which began on -266 May 8 and ended on 1014 June 15. The duration of Saros series 75 was 1280.1 years, and it contained 72 lunar eclipses.
In other fields Seventy-five is also:
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