General fact: 827 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 827 is the number of asymmetric trees with 11 vertices.
Trivia: 827 is an unremarkable number.
Historical date: April 6th is the day in 1808 that John Jacob Astor incorporates the American Fur Company, that would eventually make him America's first millionaire.