Hecho general: 5700 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5700 is divisible by its reverse.
Trivia: 5700 is an uninteresting number.
Fecha histórica: August 9th is the day in 1944 that the United States Forest Service and the Wartime Advertising Council release posters featuring Smokey Bear for the first time.