Mathematical fact: 85864 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 85864 is an unremarkable number.
Historical date: February 1st is the day in 1713 that the Kalabalik or Tumult in Bendery results from the Ottoman sultan's order that his unwelcome guest, King Charles XII of Sweden, be seized.