204638028 has 48 divisors (see below), whose sum is σ = 550556160. Its totient is φ = 57947904.

The previous prime is 204637963. The next prime is 204638029. The reversal of 204638028 is 820836402.

It is a self number, because there is not a number n which added to its sum of digits gives 204638028.

It is not an unprimeable number, because it can be changed into a prime (204638029) 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, 1288 + ... + 20271.

It is an arithmetic number, because the mean of its divisors is an integer number (11469920).

Almost surely, 2^204638028 is an apocalyptic number.

204638028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204638028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275278080).

204638028 is an abundant number, since it is smaller than the sum of its proper divisors (345918132).

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

204638028 is a wasteful number, since it uses less digits than its factorization.

204638028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21686 (or 21684 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 204638028 is about 14305.1748678581. The cubic root of 204638028 is about 589.2896055826.

The spelling of 204638028 in words is "two hundred four million, six hundred thirty-eight thousand, twenty-eight".