6721377108 has 96 divisors (see below), whose sum is σ = 16989315840. Its totient is φ = 2060298240.

The previous prime is 6721377079. The next prime is 6721377133. The reversal of 6721377108 is 8017731276.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6721377108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2907273 + ... + 2909583.

It is an arithmetic number, because the mean of its divisors is an integer number (176972040).

Almost surely, 2^6721377108 is an apocalyptic number.

6721377108 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6721377108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8494657920).

6721377108 is an abundant number, since it is smaller than the sum of its proper divisors (10267938732).

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

6721377108 is a wasteful number, since it uses less digits than its factorization.

6721377108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2655 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 6721377108 is about 81984.0051961357. The cubic root of 6721377108 is about 1887.2064875708.

The spelling of 6721377108 in words is "six billion, seven hundred twenty-one million, three hundred seventy-seven thousand, one hundred eight".