204638928 has 160 divisors (see below), whose sum is σ = 611960832. Its totient is φ = 58368000.

The previous prime is 204638909. The next prime is 204638939. The reversal of 204638928 is 829836402.

It is a self number, because there is not a number n which added to its sum of digits gives 204638928.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1071313 + ... + 1071503.

Almost surely, 2^204638928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204638928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305980416).

204638928 is an abundant number, since it is smaller than the sum of its proper divisors (407321904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204638928 is a wasteful number, since it uses less digits than its factorization.

204638928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 204638928 is about 14305.2063249713. The cubic root of 204638928 is about 589.2904694818.

The spelling of 204638928 in words is "two hundred four million, six hundred thirty-eight thousand, nine hundred twenty-eight".