Hecho general: 6778 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 6778 is an uninteresting number.
Trivia: 6778 is an unremarkable number.
Fecha histórica: July 22nd is the day in 1793 that Alexander Mackenzie reaches the Pacific Ocean becoming the first Euro-American to complete a transcontinental crossing of Canada.