Fatto generale: 8704 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8704 is an unremarkable number.
Trivia: 8704 is an unremarkable number.
Data storica: October 30th is the day in 1226 that Tran Thu Do, head of the Tran clan of Vietnam, forces Ly Hue Tong, the last emperor of the Ly dynasty, to commit suicide.