Fatto generale: 8178 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8178 is the number of ways 13 people can line up so that only one person has a taller person in front of him.
Trivia: 8178 is an unremarkable number.
Data storica: May 22nd is the day in 1942 that the Steel Workers Organizing Committee disbands, and a new trade union, the United Steelworkers, is formed.