Fatto matematico: 5629 is the maximum value of n so that there exist 5 denominations of stamps so that every postage from 1 to n can be paid for with at most 16 stamps.
Trivia: 5629 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: May 30th is the day in 1806 that Andrew Jackson kills Charles Dickinson in a duel after Dickinson had accused Jackson's wife of bigamy.