6397656624 has 30 divisors (see below), whose sum is σ = 17904553316. Its totient is φ = 2132552160.

The previous prime is 6397656593. The next prime is 6397656647. The reversal of 6397656624 is 4266567936.

6397656624 is a `hidden beast` number, since 6 + 3 + 9 + 7 + 6 + 5 + 6 + 624 = 666.

It is a super-2 number, since 2×6397656624² = 81860020557222154752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22213942 + ... + 22214229.

Almost surely, 2^6397656624 is an apocalyptic number.

It is an amenable number.

6397656624 is an abundant number, since it is smaller than the sum of its proper divisors (11506896692).

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

6397656624 is a wasteful number, since it uses less digits than its factorization.

6397656624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44428185 (or 44428176 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 54.

The square root of 6397656624 is about 79985.3525590780. The cubic root of 6397656624 is about 1856.4089018682.

The spelling of 6397656624 in words is "six billion, three hundred ninety-seven million, six hundred fifty-six thousand, six hundred twenty-four".