204147778 has 4 divisors (see below), whose sum is σ = 306221670. Its totient is φ = 102073888.

The previous prime is 204147773. The next prime is 204147817. The reversal of 204147778 is 877741402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877741402 = 2 ⋅438870701.

It can be written as a sum of positive squares in only one way, i.e., 163405089 + 40742689 = 12783^2 + 6383^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 204147778.

It is not an unprimeable number, because it can be changed into a prime (204147773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51036943 + ... + 51036946.

Almost surely, 2^204147778 is an apocalyptic number.

204147778 is a deficient number, since it is larger than the sum of its proper divisors (102073892).

204147778 is a wasteful number, since it uses less digits than its factorization.

204147778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102073891.

The product of its (nonzero) digits is 87808, while the sum is 40.

The square root of 204147778 is about 14288.0291853005. The cubic root of 204147778 is about 588.8186435231.

The spelling of 204147778 in words is "two hundred four million, one hundred forty-seven thousand, seven hundred seventy-eight".