Mathematical fact: 1708 is the number of permutations s of {1,2,3,4,5,6,7,8} for which | s(i)-i | > 1 for all i.
Trivia: 1708 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: September 3rd is the day in 1999 that an 87-automobile pile-up happens on Highway 401 freeway just East of Windsor, Ontario, Canada after an unusually thick fog from Lake St. Clair.