644332234 has 32 divisors (see below), whose sum is σ = 1195641216. Its totient is φ = 253592640.

The previous prime is 644332229. The next prime is 644332291. The reversal of 644332234 is 432233446.

It is a junction number, because it is equal to n+sod(n) for n = 644332196 and 644332205.

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 15 ways as a sum of consecutive naturals, for example, 26869 + ... + 44839.

It is an arithmetic number, because the mean of its divisors is an integer number (37363788).

Almost surely, 2^644332234 is an apocalyptic number.

644332234 is a deficient number, since it is larger than the sum of its proper divisors (551308982).

644332234 is a wasteful number, since it uses less digits than its factorization.

644332234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18190.

The product of its digits is 41472, while the sum is 31.

The square root of 644332234 is about 25383.7001636877. The cubic root of 644332234 is about 863.7139872995.

The spelling of 644332234 in words is "six hundred forty-four million, three hundred thirty-two thousand, two hundred thirty-four".