644935012 has 24 divisors (see below), whose sum is σ = 1220152640. Its totient is φ = 297237600.

The previous prime is 644935007. The next prime is 644935021. The reversal of 644935012 is 210539446.

It is a happy number.

644935012 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 7 ways as a sum of consecutive naturals, for example, 111864 + ... + 117487.

Almost surely, 2^644935012 is an apocalyptic number.

It is an amenable number.

644935012 is a deficient number, since it is larger than the sum of its proper divisors (575217628).

644935012 is a wasteful number, since it uses less digits than its factorization.

644935012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229411 (or 229409 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 644935012 is about 25395.5707161702. The cubic root of 644935012 is about 863.9832404871.

The spelling of 644935012 in words is "six hundred forty-four million, nine hundred thirty-five thousand, twelve".