General fact: 88539 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 88539 is an uninteresting number.
Trivia: 88539 is a boring number.
Historical date: May 30th is the day in 1815 that the East Indiaman ship Arniston is wrecked during a storm at Waenhuiskrans, near Cape Agulhas, present-day South Africa, with the loss of 372 lives.