Fatto generale: 5720 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5720 is a dodecagonal pyramidal number.
Trivia: 5720 is an unremarkable number.
Data storica: August 29th is the day in 1991 that Libero Grassi, an Italian businessman from Palermo is killed by the Mafia after taking a solitary stand against their extortion demands.