644734472 has 16 divisors (see below), whose sum is σ = 1241550060. Its totient is φ = 313654464.

The previous prime is 644734451. The next prime is 644734483. The reversal of 644734472 is 274437446.

644734472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 555356356 + 89378116 = 23566^2 + 9454^2 .

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, 1088783 + ... + 1089374.

Almost surely, 2^644734472 is an apocalyptic number.

It is an amenable number.

644734472 is a deficient number, since it is larger than the sum of its proper divisors (596815588).

644734472 is a wasteful number, since it uses less digits than its factorization.

644734472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178200 (or 2178196 counting only the distinct ones).

The product of its digits is 451584, while the sum is 41.

The square root of 644734472 is about 25391.6220828840. The cubic root of 644734472 is about 863.8936804759.

The spelling of 644734472 in words is "six hundred forty-four million, seven hundred thirty-four thousand, four hundred seventy-two".