644202734 has 16 divisors (see below), whose sum is σ = 1110074208. Its totient is φ = 274655232.

The previous prime is 644202721. The next prime is 644202803. The reversal of 644202734 is 437202446.

644202734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 644202734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116507 + ... + 121910.

It is an arithmetic number, because the mean of its divisors is an integer number (69379638).

Almost surely, 2^644202734 is an apocalyptic number.

644202734 is a deficient number, since it is larger than the sum of its proper divisors (465871474).

644202734 is a wasteful number, since it uses less digits than its factorization.

644202734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238619.

The product of its (nonzero) digits is 32256, while the sum is 32.

The square root of 644202734 is about 25381.1491859608. The cubic root of 644202734 is about 863.6561194017.

The spelling of 644202734 in words is "six hundred forty-four million, two hundred two thousand, seven hundred thirty-four".