644635112 has 16 divisors (see below), whose sum is σ = 1318572000. Its totient is φ = 293015920.

The previous prime is 644635093. The next prime is 644635139. The reversal of 644635112 is 211536446.

644635112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 3662612 + ... + 3662787.

It is an arithmetic number, because the mean of its divisors is an integer number (82410750).

Almost surely, 2^644635112 is an apocalyptic number.

It is an amenable number.

644635112 is an abundant number, since it is smaller than the sum of its proper divisors (673936888).

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

644635112 is a wasteful number, since it uses less digits than its factorization.

644635112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325416 (or 7325412 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 644635112 is about 25389.6654566381. The cubic root of 644635112 is about 863.8492999908.

The spelling of 644635112 in words is "six hundred forty-four million, six hundred thirty-five thousand, one hundred twelve".