Fatto generale: 477 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 477 is the smallest number whose cube contains four 3's.
Trivia: 477 is an uninteresting number.
Data storica: April 21st is the day in 1987 that the Tamil Tigers are blamed for a car bomb that explodes in the Sri Lankan city of Colombo, killing 106 people.