255780978 has 16 divisors (see below), whose sum is σ = 513084000. Its totient is φ = 85006656.

The previous prime is 255780971. The next prime is 255781007. The reversal of 255780978 is 879087552.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 255780978.

It is not an unprimeable number, because it can be changed into a prime (255780971) 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 7 ways as a sum of consecutive naturals, for example, 61228 + ... + 65271.

It is an arithmetic number, because the mean of its divisors is an integer number (32067750).

Almost surely, 2^255780978 is an apocalyptic number.

255780978 is an abundant number, since it is smaller than the sum of its proper divisors (257303022).

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

255780978 is a wasteful number, since it uses less digits than its factorization.

255780978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126841.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The square root of 255780978 is about 15993.1540979258. The cubic root of 255780978 is about 634.7792879997.

The spelling of 255780978 in words is "two hundred fifty-five million, seven hundred eighty thousand, nine hundred seventy-eight".