General fact: 27991 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 27991 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 27991 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: August 19th is the day in 1934 that the creation of the position Führer is approved by the German electorate with 89.9% of the popular vote.