Hecho general: 817 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 817 is an unremarkable number.
Trivia: 817 is an uninteresting number.
Fecha histórica: March 27th is the day in 1986 that a car bomb explodes at Russell Street Police HQ in Melbourne, killing 1 police officer and injuring 21 people.