644233372 has 12 divisors (see below), whose sum is σ = 1136015496. Its totient is φ = 319657520.

The previous prime is 644233349. The next prime is 644233393. The reversal of 644233372 is 273332446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614203 + ... + 615250.

It is an arithmetic number, because the mean of its divisors is an integer number (94667958).

Almost surely, 2^644233372 is an apocalyptic number.

It is an amenable number.

644233372 is a deficient number, since it is larger than the sum of its proper divisors (491782124).

644233372 is a wasteful number, since it uses less digits than its factorization.

644233372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229588 (or 1229586 counting only the distinct ones).

The product of its digits is 72576, while the sum is 34.

The square root of 644233372 is about 25381.7527369565. The cubic root of 644233372 is about 863.6698108869.

The spelling of 644233372 in words is "six hundred forty-four million, two hundred thirty-three thousand, three hundred seventy-two".