644084464 has 20 divisors (see below), whose sum is σ = 1251270856. Its totient is φ = 321175872.

The previous prime is 644084459. The next prime is 644084509. The reversal of 644084464 is 464480446.

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, 47994 + ... + 59929.

Almost surely, 2^644084464 is an apocalyptic number.

It is an amenable number.

644084464 is a deficient number, since it is larger than the sum of its proper divisors (607186392).

644084464 is a wasteful number, since it uses less digits than its factorization.

644084464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108304 (or 108298 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 40.

The square root of 644084464 is about 25378.8192002701. The cubic root of 644084464 is about 863.6032629248.

The spelling of 644084464 in words is "six hundred forty-four million, eighty-four thousand, four hundred sixty-four".