How Cool Is 44668877? Powered by CoolNumbers.com 98.8% Very Cool Coolness Index What makes this serial number special (or not)? 44668877 contains 4 pairs together. Only 0.0073% of 8-digit numbers have this combination. 44668877's digits sum to 50. In 4.8% of 8-digit numbers, the digits sum to at least 50. 44668877 has 4 unique digits. In 9.3% of 8-digit numbers, there are 4 or fewer unique digits.