Fatto generale: 487 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 487 is the number of Hadamard matrices of order 28.
Trivia: 487 is an unremarkable number.
Data storica: May 1st is the day in 1971 that Amtrak (the National Railroad Passenger Corporation) takes over operation of U.S. passenger rail service.