204289838778 has 32 divisors (see below), whose sum is σ = 419725163520. Its totient is φ = 66239933760.

The previous prime is 204289838699. The next prime is 204289838789. The reversal of 204289838778 is 877838982402.

204289838778 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812668 + ... + 1033928.

It is an arithmetic number, because the mean of its divisors is an integer number (13116411360).

Almost surely, 2^204289838778 is an apocalyptic number.

204289838778 is an abundant number, since it is smaller than the sum of its proper divisors (215435324742).

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

204289838778 is a wasteful number, since it uses less digits than its factorization.

204289838778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225462.

The product of its (nonzero) digits is 86704128, while the sum is 66.

It can be divided in two parts, 204 and 289838778, that added together give a palindrome (289838982).

The spelling of 204289838778 in words is "two hundred four billion, two hundred eighty-nine million, eight hundred thirty-eight thousand, seven hundred seventy-eight".