Fatto generale: 64538 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 64538 is an unremarkable number.
Trivia: 64538 is an uninteresting number.
Data storica: September 11th is the day in 1792 that the Hope Diamond is stolen along with other French crown jewels when six men break into the house used to store them.