85 (Number)

85 is the natural number following 84 and preceding 86.
Cardinaleighty-five
Ordinal85th (eighty-fifth)
Factorization 5 \cdot 17
Roman numeralLXXXV
Binary01010101
Hexadecimal55

In mathematics

Eighty-five is an octahedral number, a centered triangular number, a centered square number, a decagonal number, and a Smith number. 85 can be expressed as a sum of two squares in two ways, 85= 92 + 22 = 72 + 62

In science

In astronomy,
Messier object M85, a magnitude 10.5 lenticular galaxy in the constellation Coma Berenices
The New General Catalogue object NGC 85, a galaxy in the constellation Andromeda
The Saros number of the solar eclipse series which began on -170 March 14 and ended on 1110 April 20. The duration of Saros series 85 was 1280.1 years, and it contained 72 solar eclipses.
The Saros number of the lunar eclipse series which began on -103 August 2 and ended on 1267 November 3. The duration of Saros series 85 was 1370.3 years, and it contained 77 lunar eclipses.

In other fields

Eighty-five is also:

 

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