Fatto generale: 28311 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 28311 is an unremarkable number.
Trivia: 28311 is an unremarkable number.
Data storica: July 5th is the day in 1999 that U.S. President Bill Clinton imposes trade and economic sanctions against the Taliban regime in Afghanistan.