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 1935 that the National Labor Relations Act, which governs labor relations in the United States, is signed into law by President Franklin D. Roosevelt.