644512532 has 12 divisors (see below), whose sum is σ = 1176936096. Its totient is φ = 308245080.

The previous prime is 644512507. The next prime is 644512549. The reversal of 644512532 is 235215446.

644512532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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, 3502694 + ... + 3502877.

It is an arithmetic number, because the mean of its divisors is an integer number (98078008).

Almost surely, 2^644512532 is an apocalyptic number.

It is an amenable number.

644512532 is a deficient number, since it is larger than the sum of its proper divisors (532423564).

644512532 is a wasteful number, since it uses less digits than its factorization.

644512532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7005598 (or 7005596 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 644512532 is about 25387.2513675664. The cubic root of 644512532 is about 863.7945416954.

Adding to 644512532 its reverse (235215446), we get a palindrome (879727978).

The spelling of 644512532 in words is "six hundred forty-four million, five hundred twelve thousand, five hundred thirty-two".