Fait général: 47784 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 47784 is an unremarkable number.
Culture générale: 47784 is a boring number.
Date historique: October 29th is the day in 1991 that the American Galileo spacecraft makes its closest approach to 951 Gaspra, becoming the first probe to visit an asteroid.