Fatto matematico: 7880 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 26 stamps.
Trivia: 7880 is an uninteresting number.
Data storica: July 28th is the day in 2010 that Airblue Flight 202 crashes into the Margalla Hills north of Islamabad, Pakistan, killing all 152 people aboard.