6624642864 has 40 divisors (see below), whose sum is σ = 19558470400. Its totient is φ = 1892755008.

The previous prime is 6624642851. The next prime is 6624642877. The reversal of 6624642864 is 4682464266.

It is an interprime number because it is at equal distance from previous prime (6624642851) and next prime (6624642877).

It is a super-2 number, since 2×6624642864² = 87771786151092244992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9857764 + ... + 9858435.

It is an arithmetic number, because the mean of its divisors is an integer number (488961760).

Almost surely, 2^6624642864 is an apocalyptic number.

It is an amenable number.

6624642864 is an abundant number, since it is smaller than the sum of its proper divisors (12933827536).

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

6624642864 is a wasteful number, since it uses less digits than its factorization.

6624642864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19716217 (or 19716211 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 48.

The square root of 6624642864 is about 81391.9090819229. The cubic root of 6624642864 is about 1878.1091279539.

The spelling of 6624642864 in words is "six billion, six hundred twenty-four million, six hundred forty-two thousand, eight hundred sixty-four".