644124604 has 12 divisors (see below), whose sum is σ = 1141487200. Its totient is φ = 317985408.

The previous prime is 644124599. The next prime is 644124619. The reversal of 644124604 is 406421446.

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, 1018869 + ... + 1019500.

Almost surely, 2^644124604 is an apocalyptic number.

It is an amenable number.

644124604 is a deficient number, since it is larger than the sum of its proper divisors (497362596).

644124604 is a wasteful number, since it uses less digits than its factorization.

644124604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038452 (or 2038450 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 644124604 is about 25379.6100048838. The cubic root of 644124604 is about 863.6212027638.

The spelling of 644124604 in words is "six hundred forty-four million, one hundred twenty-four thousand, six hundred four".