Hecho general: 4650 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4650 is the maximum number of regions space can be divided into by 25 spheres.
Trivia: 4650 is an uninteresting number.
Fecha histórica: September 23rd is the day in 1889 that Nintendo Koppai (Later Nintendo Company, Limited) is founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda.