644010052 has 48 divisors (see below), whose sum is σ = 1314593280. Its totient is φ = 270369792.

The previous prime is 644010043. The next prime is 644010053. The reversal of 644010052 is 250010446.

It is not an unprimeable number, because it can be changed into a prime (644010053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280453 + ... + 282739.

It is an arithmetic number, because the mean of its divisors is an integer number (27387360).

Almost surely, 2^644010052 is an apocalyptic number.

It is an amenable number.

644010052 is an abundant number, since it is smaller than the sum of its proper divisors (670583228).

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

644010052 is a wasteful number, since it uses less digits than its factorization.

644010052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500 (or 2498 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 644010052 is about 25377.3531322713. The cubic root of 644010052 is about 863.5700038702.

Adding to 644010052 its reverse (250010446), we get a palindrome (894020498).

The spelling of 644010052 in words is "six hundred forty-four million, ten thousand, fifty-two".