644306234 has 32 divisors (see below), whose sum is σ = 1166126976. Its totient is φ = 263027520.

The previous prime is 644306233. The next prime is 644306251. The reversal of 644306234 is 432603446.

It is a self number, because there is not a number n which added to its sum of digits gives 644306234.

It is not an unprimeable number, because it can be changed into a prime (644306231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19862 + ... + 41025.

It is an arithmetic number, because the mean of its divisors is an integer number (36441468).

Almost surely, 2^644306234 is an apocalyptic number.

644306234 is a deficient number, since it is larger than the sum of its proper divisors (521820742).

644306234 is a wasteful number, since it uses less digits than its factorization.

644306234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60950.

The product of its (nonzero) digits is 41472, while the sum is 32.

The square root of 644306234 is about 25383.1880188443. The cubic root of 644306234 is about 863.7023696564.

The spelling of 644306234 in words is "six hundred forty-four million, three hundred six thousand, two hundred thirty-four".