Mathematical fact: 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 boring number.
Historical date: May 30th is the day in 1959 that the Auckland Harbour Bridge, crossing the Waitemata Harbour in Auckland, New Zealand, is officially opened by Governor-General Lord Cobham.