Fatto matematico: 72643 is an uninteresting number.
Trivia: 72643 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: November 21st is the day in 1969 that U.S. President Richard Nixon and Japanese Premier Eisaku Sato agree in Washington, D.C. on the return of Okinawa to Japanese control in 1972.