204644138 has 16 divisors (see below), whose sum is σ = 316008000. Its totient is φ = 99337056.

The previous prime is 204644137. The next prime is 204644173. The reversal of 204644138 is 831446402.

204644138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (204644131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7238 + ... + 21486.

It is an arithmetic number, because the mean of its divisors is an integer number (19750500).

Almost surely, 2^204644138 is an apocalyptic number.

204644138 is a deficient number, since it is larger than the sum of its proper divisors (111363862).

204644138 is a wasteful number, since it uses less digits than its factorization.

204644138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14461.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 204644138 is about 14305.3884253452. The cubic root of 204644138 is about 589.2954704483.

The spelling of 204644138 in words is "two hundred four million, six hundred forty-four thousand, one hundred thirty-eight".