General fact: 5715 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 5715 is a boring number.
Trivia: 5715 is a boring number.
Historical date: August 24th is the day in 2001 that Air Transat Flight 236 runs out of fuel over the Atlantic Ocean (en route to Lisbon from Toronto) and makes an emergency landing in the Azores.