A page of the Numeropedia - the Special Encyclopedia of Numbers
[Chemistry] The atomic number of Astatine (At).
[Library] ISBN-85 is the International Standard Book Number for books published in Brazil.
[Math.] 854 = 52,200,625 = (52+20+06+2+5)4
8510 = 19,687,440,434,072,265,625 =
[Math.] A number that can be sum of 2 different square numbers in 2 ways:
85 = 62+72 = 22+92.
[Math.] A regular polygon with this odd number (product of Fermat prime numbers) of sides is constructible by using only straightedge and compass. 85 = 5´17.
[Math.] 1+2+…+645 = 12+22+…+852 = 208,335.
[Sport] The size of an ice hockey rink: 200 feet long & 85 feet wide (or 61 meters long and 25.9 meters wide).
[Tech.] The loudest volume (measured in decibels) a person's ear can handle without risking permanent damage is known as 85 decibels.
[Tech.] The numbers of automobile gear oil SAE viscosity: 75W, 80W, 80W-90, 85W, 90W and 140W.
[Tech.] E-85, a kind of fuel for alternative fuel vehicles, is a blend of 85% ethanol and 15% gasoline.