Mathematical fact: 27424 is an uninteresting number.
Trivia: 27424 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: January 30th is the day in 1889 that Archduke Crown Prince Rudolf of Austria, heir to the Austro-Hungarian crown, is found dead with his mistress Baroness Mary Vetsera in Mayerling.