256123878 has 16 divisors (see below), whose sum is σ = 521913456. Its totient is φ = 83763680.

The previous prime is 256123871. The next prime is 256123919. The reversal of 256123878 is 878321652.

256123878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256123871) 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, 402393 + ... + 403028.

It is an arithmetic number, because the mean of its divisors is an integer number (32619591).

Almost surely, 2^256123878 is an apocalyptic number.

256123878 is an abundant number, since it is smaller than the sum of its proper divisors (265789578).

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

256123878 is a wasteful number, since it uses less digits than its factorization.

256123878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805479.

The product of its digits is 161280, while the sum is 42.

The square root of 256123878 is about 16003.8707192979. The cubic root of 256123878 is about 635.0628230568.

The spelling of 256123878 in words is "two hundred fifty-six million, one hundred twenty-three thousand, eight hundred seventy-eight".