Fait général: 91804 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 91804 is a boring number.
Culture générale: 91804 is an uninteresting number.
Date historique: May 8th is the day in 1976 that the rollercoaster Revolution, the first steel coaster with a vertical loop, opens at Six Flags Magic Mountain.