# 85 (number)

85 is the natural number following 84 and preceding 86.

 List of numbers — Integers << 80 81 82 83 84 85 86 87 88 89 >>
Cardinaleighty-five
Ordinal85th (eighty-fifth)
Factorization[itex] 5 \cdot 17 [itex]
Roman numeralLXXXV
Binary01010101

## 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 other fields

Published in Brazil:
ISBN 85..

Eighty-five is also:

es:Ochenta y cinco

• Art and Cultures
• Countries of the World (http://www.academickids.com/encyclopedia/index.php/Countries)
• Space and Astronomy