general_fact: 2715 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2715 is an unremarkable number.
trivia: 2715 is a boring number.
historical_date: June 7th is the day in 1628 that the Petition of Right, a major English constitutional document, is granted the Royal Assent by Charles I and becomes law.