Fait général: 6825 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6825 is an odd primitive abundant number.
Culture générale: 6825 is an unremarkable number.
Date historique: September 7th is the day in 1906 that Alberto Santos-Dumont flies his 14-bis aircraft at Bagatelle, France for the first time successfully.