Fait général: 5993 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 5993 is the largest number known which is not the sum of a prime and twice a square.
Culture générale: 5993 is an uninteresting number.
Date historique: May 28th is the day in 585 BC that a solar eclipse occurs while Alyattes is battling Cyaxares in the Battle of the Eclipse, leading to a truce.