Hecho general: 2782 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 2782 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 19 stamps.
Trivia: 2782 is an unremarkable number.
Fecha histórica: August 13th is the day in 1960 that the Central African Republic declares independence from France.