644334364 has 12 divisors (see below), whose sum is σ = 1127763000. Its totient is φ = 322116368.

The previous prime is 644334359. The next prime is 644334367. The reversal of 644334364 is 463433446.

644334364 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644334367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41967 + ... + 55225.

It is an arithmetic number, because the mean of its divisors is an integer number (93980250).

Almost surely, 2^644334364 is an apocalyptic number.

It is an amenable number.

644334364 is a deficient number, since it is larger than the sum of its proper divisors (483428636).

644334364 is a wasteful number, since it uses less digits than its factorization.

644334364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25412 (or 25410 counting only the distinct ones).

The product of its digits is 248832, while the sum is 37.

The square root of 644334364 is about 25383.7421197112. The cubic root of 644334364 is about 863.7149390387.

The spelling of 644334364 in words is "six hundred forty-four million, three hundred thirty-four thousand, three hundred sixty-four".