6404625656 has 32 divisors (see below), whose sum is σ = 14108094000. Its totient is φ = 2687255040.

The previous prime is 6404625653. The next prime is 6404625673. The reversal of 6404625656 is 6565264046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404625653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2798081 + ... + 2800368.

Almost surely, 2^6404625656 is an apocalyptic number.

It is an amenable number.

6404625656 is an abundant number, since it is smaller than the sum of its proper divisors (7703468344).

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

6404625656 is a wasteful number, since it uses less digits than its factorization.

6404625656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598479 (or 5598475 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

The square root of 6404625656 is about 80028.9051280848. The cubic root of 6404625656 is about 1857.0827255842.

The spelling of 6404625656 in words is "six billion, four hundred four million, six hundred twenty-five thousand, six hundred fifty-six".