Fatto generale: 83570 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 83570 is a boring number.
Trivia: 83570 is a boring number.
Data storica: October 21st is the day in 1774 that First display of the word "Liberty" on a flag, raised by colonists in Taunton, Massachusetts in defiance of British rule in Colonial America.