Fatto matematico: 2805 is the smallest order of a cyclotomic polynomial whose factorization contains 6 as a coefficient.
Trivia: 2805 is an uninteresting number.
Data storica: September 5th is the day in 1980 that the St. Gotthard Tunnel opens in Switzerland as the world's longest highway tunnel at 10.14 miles (16.224 km) stretching from Göschenen to Airolo.