644452472 has 16 divisors (see below), whose sum is σ = 1219435800. Its totient is φ = 319269600.

The previous prime is 644452463. The next prime is 644452489. The reversal of 644452472 is 274254446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368654 + ... + 370397.

Almost surely, 2^644452472 is an apocalyptic number.

It is an amenable number.

644452472 is a deficient number, since it is larger than the sum of its proper divisors (574983328).

644452472 is a wasteful number, since it uses less digits than its factorization.

644452472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739166 (or 739162 counting only the distinct ones).

The product of its digits is 215040, while the sum is 38.

The square root of 644452472 is about 25386.0684628400. The cubic root of 644452472 is about 863.7677094725.

The spelling of 644452472 in words is "six hundred forty-four million, four hundred fifty-two thousand, four hundred seventy-two".