Mathematical fact: 2800 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 2800 is a boring number.
Historical date: August 31st is the day in 1986 that Aeroméxico Flight 498 collides with a Piper PA-28 over Cerritos, California, killing 67 in the air and 15 on the ground.