Fatto generale: 5776 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5776 is the square of the last half of its digits.
Trivia: 5776 is an unremarkable number.
Data storica: October 24th is the day in 1930 that a bloodless coup d'état in Brazil ousts Washington Luís Pereira de Sousa, the last President of the First Republic.