Fatto matematico: 4480 is a value of n for which n, 2n, 3n, and 4n all use the same number of digits in Roman numerals.
Trivia: 4480 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 6th is the day in 1814 that Nominal beginning of the Bourbon Restoration — anniversary date that Napoleon abdicates and is exiled to Elba.