Fait mathématique: 8658 is the sum of the first 4 perfect numbers.
Culture générale: 8658 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: September 14th is the day in 1979 that Afghan President Nur Muhammad Taraki is assassinated upon the order of Hafizullah Amin, who becomes the new president.