Hecho matemático: 652 is the only known non-perfect number whose number of divisors and sum of smaller divisors are perfect.
Trivia: 652 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: October 13th is the day in 1992 that an Antonov An-124 operated by Antonov Airlines registered SSSR-82002, crashes near Kiev, Ukraine killing 8.