Fatto matematico: 1582 is a value of n so that n(n+4) is a palindrome.
Trivia: 1582 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 30th is the day in 1937 that the Philippines holds a plebiscite for Filipino women on whether they should be extended the right to suffrage; over 90% would vote in the affirmative.