Mathematical fact: 716 is the smallest number whose cube contains four 6's.
Trivia: 716 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: December 16th is the day in 1997 that an episode of Pokémon, "Dennō Senshi Porygon", aired in Japan induces seizures in 685 Japanese children.