646964044 has 6 divisors (see below), whose sum is σ = 1132187084. Its totient is φ = 323482020.

The previous prime is 646964039. The next prime is 646964077. The reversal of 646964044 is 440469646.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80870502 + ... + 80870509.

Almost surely, 2^646964044 is an apocalyptic number.

It is an amenable number.

646964044 is a deficient number, since it is larger than the sum of its proper divisors (485223040).

646964044 is a wasteful number, since it uses less digits than its factorization.

646964044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161741015 (or 161741013 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 43.

The square root of 646964044 is about 25435.4878860226. The cubic root of 646964044 is about 864.8883520572. Note that the first 3 decimals are identical.

The spelling of 646964044 in words is "six hundred forty-six million, nine hundred sixty-four thousand, forty-four".