256123478 has 16 divisors (see below), whose sum is σ = 414004416. Its totient is φ = 118134720.

The previous prime is 256123463. The next prime is 256123489. The reversal of 256123478 is 874321652.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68723 + ... + 72353.

It is an arithmetic number, because the mean of its divisors is an integer number (25875276).

Almost surely, 2^256123478 is an apocalyptic number.

256123478 is a deficient number, since it is larger than the sum of its proper divisors (157880938).

256123478 is a wasteful number, since it uses less digits than its factorization.

256123478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6359.

The product of its digits is 80640, while the sum is 38.

The square root of 256123478 is about 16003.8582223163. The cubic root of 256123478 is about 635.0624924547.

The spelling of 256123478 in words is "two hundred fifty-six million, one hundred twenty-three thousand, four hundred seventy-eight".