204800778 has 128 divisors (see below), whose sum is σ = 568995840. Its totient is φ = 53161920.

The previous prime is 204800767. The next prime is 204800779. The reversal of 204800778 is 877008402.

204800778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (204800779) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 348601 + ... + 349187.

It is an arithmetic number, because the mean of its divisors is an integer number (4445280).

Almost surely, 2^204800778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204800778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284497920).

204800778 is an abundant number, since it is smaller than the sum of its proper divisors (364195062).

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

204800778 is a wasteful number, since it uses less digits than its factorization.

204800778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 204800778 is about 14310.8622381742. The cubic root of 204800778 is about 589.4457861816.

The spelling of 204800778 in words is "two hundred four million, eight hundred thousand, seven hundred seventy-eight".