Fait général: 15504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 15504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 15504 is a boring number.
Date historique: June 12th is the day in 1979 that Bryan Allen wins the second Kremer prize for a man powered flight across the English Channel in the Gossamer Albatross.