644716052 has 24 divisors (see below), whose sum is σ = 1204815360. Its totient is φ = 301200480.

The previous prime is 644716049. The next prime is 644716057. The reversal of 644716052 is 250617446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644716057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86048 + ... + 93239.

It is an arithmetic number, because the mean of its divisors is an integer number (50200640).

Almost surely, 2^644716052 is an apocalyptic number.

644716052 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

644716052 is a deficient number, since it is larger than the sum of its proper divisors (560099308).

644716052 is a wasteful number, since it uses less digits than its factorization.

644716052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179351 (or 179349 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 644716052 is about 25391.2593622294. The cubic root of 644716052 is about 863.8854532786.

The spelling of 644716052 in words is "six hundred forty-four million, seven hundred sixteen thousand, fifty-two".