Fatto matematico: 8913 is the maximum value of n so that there exist 4 denominations of stamps so that every postage from 1 to n can be paid for with at most 27 stamps.
Trivia: 8913 is an unremarkable number.
Data storica: May 26th is the day in 1293 that an earthquake strikes Kamakura, Kanagawa, Japan, killing about 30,000.