644734060 has 12 divisors (see below), whose sum is σ = 1353941568. Its totient is φ = 257893616.

The previous prime is 644734037. The next prime is 644734093. The reversal of 644734060 is 60437446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16118332 + ... + 16118371.

It is an arithmetic number, because the mean of its divisors is an integer number (112828464).

Almost surely, 2^644734060 is an apocalyptic number.

It is an amenable number.

644734060 is an abundant number, since it is smaller than the sum of its proper divisors (709207508).

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

644734060 is a wasteful number, since it uses less digits than its factorization.

644734060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32236712 (or 32236710 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 644734060 is about 25391.6139699705. The cubic root of 644734060 is about 863.8934964600.

The spelling of 644734060 in words is "six hundred forty-four million, seven hundred thirty-four thousand, sixty".