644310394 has 16 divisors (see below), whose sum is σ = 1189496448. Its totient is φ = 254891952.

The previous prime is 644310383. The next prime is 644310413. The reversal of 644310394 is 493013446.

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 7 ways as a sum of consecutive naturals, for example, 1769902 + ... + 1770265.

It is an arithmetic number, because the mean of its divisors is an integer number (74343528).

Almost surely, 2^644310394 is an apocalyptic number.

644310394 is a deficient number, since it is larger than the sum of its proper divisors (545186054).

644310394 is a wasteful number, since it uses less digits than its factorization.

644310394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540189.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 644310394 is about 25383.2699627136. The cubic root of 644310394 is about 863.7042285003.

The spelling of 644310394 in words is "six hundred forty-four million, three hundred ten thousand, three hundred ninety-four".