Fatto generale: 90866 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 90866 is an unremarkable number.
Trivia: 90866 is an uninteresting number.
Data storica: October 12th is the day in 1933 that the United States Army Disciplinary Barracks on Alcatraz Island, is acquired by the United States Department of Justice.