Fait mathématique: 83712 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 83712 is an uninteresting number.
Date historique: March 12th is the day in 1930 that Mahatma Gandhi leads a 200-mile march, known as the Salt March, to the sea in defiance of British opposition, to protest the British monopoly on salt.