Fait général: 85829 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 85829 is an uninteresting number.
Culture générale: 85829 is an uninteresting number.
Date historique: December 28th is the day in 1895 that Wilhelm Röntgen publishes a paper detailing his discovery of a new type of radiation, which later will be known as x-rays.