Fait général: 2870 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2870 is the sum of the first 20 squares.
Culture générale: 2870 is an unremarkable number.
Date historique: November 9th is the day in 1985 that Garry Kasparov, 22, of the Soviet Union becomes the youngest World Chess Champion by beating Anatoly Karpov, also of the Soviet Union.