Fait général: 5709 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 5709 is a structured pentakis dodecahedral number.
Culture générale: 5709 is an uninteresting number.
Date historique: August 18th is the day in 1917 that a Great Fire in Thessaloniki, Greece destroys 32% of the city leaving 70,000 individuals homeless.