Hecho general: 2828 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 2828 is a value of n so that n(n+8) is a palindrome.
Trivia: 2828 is an uninteresting number.
Fecha histórica: September 28th is the day in 1781 that American forces backed by a French fleet begin the siege of Yorktown, Virginia, during the American Revolutionary War.