644546552 has 16 divisors (see below), whose sum is σ = 1301488440. Its totient is φ = 297482976.

The previous prime is 644546531. The next prime is 644546561. The reversal of 644546552 is 255645446.

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, 3098678 + ... + 3098885.

Almost surely, 2^644546552 is an apocalyptic number.

It is an amenable number.

644546552 is an abundant number, since it is smaller than the sum of its proper divisors (656941888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644546552 is a wasteful number, since it uses less digits than its factorization.

644546552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197582 (or 6197578 counting only the distinct ones).

The product of its digits is 576000, while the sum is 41.

The square root of 644546552 is about 25387.9213800579. The cubic root of 644546552 is about 863.8097396276.

The spelling of 644546552 in words is "six hundred forty-four million, five hundred forty-six thousand, five hundred fifty-two".