646968944 has 20 divisors (see below), whose sum is σ = 1255459824. Its totient is φ = 322979328.

The previous prime is 646968923. The next prime is 646968947. The reversal of 646968944 is 449869646.

It is a self number, because there is not a number n which added to its sum of digits gives 646968944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646968947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20897 + ... + 41600.

Almost surely, 2^646968944 is an apocalyptic number.

It is an amenable number.

646968944 is a deficient number, since it is larger than the sum of its proper divisors (608490880).

646968944 is a wasteful number, since it uses less digits than its factorization.

646968944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63152 (or 63146 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 56.

The square root of 646968944 is about 25435.5842079556. The cubic root of 646968944 is about 864.8905355594.

The spelling of 646968944 in words is "six hundred forty-six million, nine hundred sixty-eight thousand, nine hundred forty-four".