Fatto generale: 81640 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 81640 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 81640 is a boring number.
Data storica: July 10th is the day in 1850 that Millard Fillmore is inaugurated as the 13th President of the United States upon the death of President Zachary Taylor, 16 months into his term.