general_fact: 28972 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 28972 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 28972 is a boring number.
historical_date: April 27th is the day in 2011 that the deadliest day of the 2011 Super outbreak of tornadoes, the largest tornado outbreak, in United States history.