Fatto generale: 28447 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 28447 is an uninteresting number.
Trivia: 28447 is an uninteresting number.
Data storica: November 18th is the day in 1883 that American and Canadian railroads institute five standard continental time zones, ending the confusion of thousands of local times.