Hecho general: 5755 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5755 is the sum of the digits of the 19^{th} Mersenne prime.
Trivia: 5755 is an unremarkable number.
Fecha histórica: October 3rd is the day in 1908 that the Pravda newspaper is founded by Leon Trotsky, Adolph Joffe, Matvey Skobelev and other Russian exiles in Vienna.