644945932 has 24 divisors (see below), whose sum is σ = 1196478864. Its totient is φ = 303140352.

The previous prime is 644945909. The next prime is 644945957. The reversal of 644945932 is 239549446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56448 + ... + 66904.

It is an arithmetic number, because the mean of its divisors is an integer number (49853286).

Almost surely, 2^644945932 is an apocalyptic number.

It is an amenable number.

644945932 is a deficient number, since it is larger than the sum of its proper divisors (551532932).

644945932 is a wasteful number, since it uses less digits than its factorization.

644945932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11385 (or 11383 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 644945932 is about 25395.7857133817. The cubic root of 644945932 is about 863.9881167633.

The spelling of 644945932 in words is "six hundred forty-four million, nine hundred forty-five thousand, nine hundred thirty-two".