255778923 has 16 divisors (see below), whose sum is σ = 372750336. Its totient is φ = 155310720.

The previous prime is 255778909. The next prime is 255778961. The reversal of 255778923 is 329877552.

It is a happy number.

It is not a de Polignac number, because 255778923 - 2⁸ = 255778667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255778723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79311 + ... + 82472.

It is an arithmetic number, because the mean of its divisors is an integer number (23296896).

Almost surely, 2^255778923 is an apocalyptic number.

255778923 is a deficient number, since it is larger than the sum of its proper divisors (116971413).

255778923 is a wasteful number, since it uses less digits than its factorization.

255778923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161834.

The product of its digits is 1058400, while the sum is 48.

The square root of 255778923 is about 15993.0898515578. The cubic root of 255778923 is about 634.7775880102. Note that the first 3 decimals are identical.

The spelling of 255778923 in words is "two hundred fifty-five million, seven hundred seventy-eight thousand, nine hundred twenty-three".