Fatto generale: 86678 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 86678 is a boring number.
Trivia: 86678 is an uninteresting number.
Data storica: April 25th is the day in 1134 that the name Zagreb was mentioned for the first time in the Felician Charter relating to the establishment of the Zagreb Bishopric around 1094.