256442478 has 32 divisors (see below), whose sum is σ = 530675712. Its totient is φ = 82528800.

The previous prime is 256442477. The next prime is 256442519. The reversal of 256442478 is 874244652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256442477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92188 + ... + 94928.

It is an arithmetic number, because the mean of its divisors is an integer number (16583616).

Almost surely, 2^256442478 is an apocalyptic number.

256442478 is an abundant number, since it is smaller than the sum of its proper divisors (274233234).

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

256442478 is a wasteful number, since it uses less digits than its factorization.

256442478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280.

The product of its digits is 430080, while the sum is 42.

The square root of 256442478 is about 16013.8214677197. The cubic root of 256442478 is about 635.3260383673.

The spelling of 256442478 in words is "two hundred fifty-six million, four hundred forty-two thousand, four hundred seventy-eight".