Hecho general: 7717 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 7717 is an uninteresting number.
Trivia: 7717 is an unremarkable number.
Fecha histórica: February 15th is the day in 1946 that ENIAC, the first electronic general-purpose computer, is formally dedicated at the University of Pennsylvania in Philadelphia.