204128355 has 16 divisors (see below), whose sum is σ = 327549600. Its totient is φ = 108553728.

The previous prime is 204128341. The next prime is 204128359. The reversal of 204128355 is 553821402.

It is not a de Polignac number, because 204128355 - 2⁴ = 204128339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204128359) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 14262 + ... + 24731.

It is an arithmetic number, because the mean of its divisors is an integer number (20471850).

Almost surely, 2^204128355 is an apocalyptic number.

204128355 is a deficient number, since it is larger than the sum of its proper divisors (123421245).

204128355 is a wasteful number, since it uses less digits than its factorization.

204128355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39350.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 204128355 is about 14287.3494742727. The cubic root of 204128355 is about 588.7999691632.

Adding to 204128355 its reverse (553821402), we get a palindrome (757949757).

The spelling of 204128355 in words is "two hundred four million, one hundred twenty-eight thousand, three hundred fifty-five".