204778245 has 16 divisors (see below), whose sum is σ = 374451840. Its totient is φ = 93612864.

The previous prime is 204778241. The next prime is 204778247. The reversal of 204778245 is 542877402.

It is not a de Polignac number, because 204778245 - 2² = 204778241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204778241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 975030 + ... + 975239.

It is an arithmetic number, because the mean of its divisors is an integer number (23403240).

Almost surely, 2^204778245 is an apocalyptic number.

It is an amenable number.

204778245 is a deficient number, since it is larger than the sum of its proper divisors (169673595).

204778245 is a wasteful number, since it uses less digits than its factorization.

204778245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950284.

The product of its (nonzero) digits is 125440, while the sum is 39.

The square root of 204778245 is about 14310.0749473928. The cubic root of 204778245 is about 589.4241676618.

The spelling of 204778245 in words is "two hundred four million, seven hundred seventy-eight thousand, two hundred forty-five".