Fait général: 52520 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 52520 is an unremarkable number.
Culture générale: 52520 is a boring number.
Date historique: October 17th is the day in 1964 that Prime Minister of Australia Robert Menzies opens the artificial Lake Burley Griffin in the middle of the capital Canberra.