Fatto generale: 86579 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 86579 is an uninteresting number.
Trivia: 86579 is an uninteresting number.
Data storica: January 16th is the day in 1707 that the Scottish Parliament ratifies the Act of Union, paving the way for the creation of Great Britain.