205115128 has 16 divisors (see below), whose sum is σ = 393971760. Its totient is φ = 100056000.

The previous prime is 205115111. The next prime is 205115129. The reversal of 205115128 is 821511502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205115129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312348 + ... + 313003.

It is an arithmetic number, because the mean of its divisors is an integer number (24623235).

Almost surely, 2^205115128 is an apocalyptic number.

It is an amenable number.

205115128 is a deficient number, since it is larger than the sum of its proper divisors (188856632).

205115128 is a wasteful number, since it uses less digits than its factorization.

205115128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625398 (or 625394 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 205115128 is about 14321.8409431190. The cubic root of 205115128 is about 589.7472133594.

The spelling of 205115128 in words is "two hundred five million, one hundred fifteen thousand, one hundred twenty-eight".