Fatto matematico: 28778 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 28778 is an uninteresting number.
Data storica: October 15th is the day in 2008 that the Dow Jones Industrial Average closed down 733.08 points, or 7.87%, the second worst day in the Dow's history based on a percentage drop.