6400647056 has 10 divisors (see below), whose sum is σ = 12401253702. Its totient is φ = 3200323520.

The previous prime is 6400647047. The next prime is 6400647073. The reversal of 6400647056 is 6507460046.

It can be written as a sum of positive squares in only one way, i.e., 5200717456 + 1199929600 = 72116^2 + 34640^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200020205 + ... + 200020236.

Almost surely, 2^6400647056 is an apocalyptic number.

It is an amenable number.

6400647056 is a deficient number, since it is larger than the sum of its proper divisors (6000606646).

6400647056 is a wasteful number, since it uses less digits than its factorization.

6400647056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400040449 (or 400040443 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 6400647056 is about 80004.0439977880. The cubic root of 6400647056 is about 1856.6981015012.

The spelling of 6400647056 in words is "six billion, four hundred million, six hundred forty-seven thousand, fifty-six".