Fatto generale: 13633 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 13633 is a boring number.
Trivia: 13633 is a boring number.
Data storica: April 28th is the day in 1948 that Igor Stravinsky conducted the premier of his American ballet, Orpheus, in New York City at New York City Center.