Hecho general: 8857 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 8857 is a structured truncated tetrahedral number.
Trivia: 8857 is an unremarkable number.
Fecha histórica: March 31st is the day in 1995 that Selena, an American singer, was murdered by her friend and employee of her boutiques Yolanda Saldívar who was embezzling money from the establishments.