Fatto generale: 64870 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 64870 is a boring number.
Trivia: 64870 is an unremarkable number.
Data storica: August 9th is the day in 1842 that the Webster-Ashburton Treaty is signed, establishing the United States-Canada border east of the Rocky Mountains.