Fait général: 83864 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 83864 is an unremarkable number.
Culture générale: 83864 is an uninteresting number.
Date historique: August 11th is the day in 3114 BC that the Mesoamerican Long Count calendar, used by several pre-Columbian Mesoamerican civilizations, notably the Mayans, begins.