204778838 has 16 divisors (see below), whose sum is σ = 354804624. Its totient is φ = 87605760.

The previous prime is 204778837. The next prime is 204778897. The reversal of 204778838 is 838877402.

It is a happy number.

204778838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204778792 and 204778801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204778837) 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, 273395 + ... + 274142.

It is an arithmetic number, because the mean of its divisors is an integer number (22175289).

Almost surely, 2^204778838 is an apocalyptic number.

204778838 is a deficient number, since it is larger than the sum of its proper divisors (150025786).

204778838 is a wasteful number, since it uses less digits than its factorization.

204778838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547567.

The product of its (nonzero) digits is 602112, while the sum is 47.

The square root of 204778838 is about 14310.0956670457. The cubic root of 204778838 is about 589.4247366158.

The spelling of 204778838 in words is "two hundred four million, seven hundred seventy-eight thousand, eight hundred thirty-eight".