Fatto matematico: 633 is the smallest number n whose 5^{th} root has a decimal part that begins with the digits of n.
Trivia: 633 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 24th is the day in 2005 that Hurricane Rita makes landfall in the United States, devastating Beaumont, Texas and portions of southwestern Louisiana.