Fatto generale: 81745 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 81745 is an uninteresting number.
Trivia: 81745 is a boring number.
Data storica: October 23rd is the day in 2011 that a powerful 7.2 magnitude earthquake strikes Van Province, Turkey, killing 582 people and injuring thousands.