679
681
The Number 680: Properties and Meanings
Prime Factors of 680=2x2x2x5x17.
680 is a 26-gonal Number.
680 is a Tetrahedral Number.
680 is the smallest tetrahedral number that is also the sum of 2 Tetrahedral Numbers.
The Year 680 AD
In the year 680 AD...
679
681