general_fact: 2878 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2878 is the number of integers with complexity 28.
trivia: 2878 is an uninteresting number.
historical_date: November 17th is the day in 2000 that a catastrophic landslide in Log pod Mangartom, Slovenia, kills 7, and causes millions of SIT of damage.