6349991980 has 48 divisors (see below), whose sum is σ = 14174528256. Its totient is φ = 2381250560.

The previous prime is 6349991959. The next prime is 6349992001. The reversal of 6349991980 is 891999436.

It is an interprime number because it is at equal distance from previous prime (6349991959) and next prime (6349992001).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51045 + ... + 123715.

It is an arithmetic number, because the mean of its divisors is an integer number (295302672).

Almost surely, 2^6349991980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6349991980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7087264128).

6349991980 is an abundant number, since it is smaller than the sum of its proper divisors (7824536276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6349991980 is a wasteful number, since it uses less digits than its factorization.

6349991980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72954 (or 72952 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 6349991980 is about 79686.8369305747. The cubic root of 6349991980 is about 1851.7871194278.

The spelling of 6349991980 in words is "six billion, three hundred forty-nine million, nine hundred ninety-one thousand, nine hundred eighty".