204121728 has 64 divisors (see below), whose sum is σ = 602452800. Its totient is φ = 68039424.

The previous prime is 204121727. The next prime is 204121741. The reversal of 204121728 is 827121402.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204121721) 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, 26076 + ... + 32987.

It is an arithmetic number, because the mean of its divisors is an integer number (9413325).

Almost surely, 2^204121728 is an apocalyptic number.

It is an amenable number.

204121728 is an abundant number, since it is smaller than the sum of its proper divisors (398331072).

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

204121728 is an equidigital number, since it uses as much as digits as its factorization.

204121728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59086 (or 59068 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 204121728 is about 14287.1175539365. The cubic root of 204121728 is about 588.7935973233.

The spelling of 204121728 in words is "two hundred four million, one hundred twenty-one thousand, seven hundred twenty-eight".