Fatto generale: 28191 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 28191 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 28191 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 7th is the day in 1900 that the German liner SS Kaiser Wilhelm der Grosse becomes the first ship to send wireless signals to shore.