general_fact: 4506 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4506 is the sum of its proper divisors that contain the digit 5.
trivia: 4506 is an unremarkable number.
historical_date: May 2nd is the day in 1989 that Hungary begins dismantling its border fence with Austria, which allows a number of East Germans to defect.