645600928 has 48 divisors (see below), whose sum is σ = 1454350464. Its totient is φ = 276353280.

The previous prime is 645600913. The next prime is 645600931. The reversal of 645600928 is 829006546.

It is a happy number.

It is a super-2 number, since 2×645600928² = 833601116468922368, which contains 22 as substring.

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, 308301 + ... + 310387.

It is an arithmetic number, because the mean of its divisors is an integer number (30298968).

Almost surely, 2^645600928 is an apocalyptic number.

It is an amenable number.

645600928 is an abundant number, since it is smaller than the sum of its proper divisors (808749536).

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

645600928 is a wasteful number, since it uses less digits than its factorization.

645600928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485 (or 3477 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 645600928 is about 25408.6782025354. The cubic root of 645600928 is about 864.2805016309.

The spelling of 645600928 in words is "six hundred forty-five million, six hundred thousand, nine hundred twenty-eight".