256486578 has 32 divisors (see below), whose sum is σ = 524228352. Its totient is φ = 83635200.

The previous prime is 256486561. The next prime is 256486613. The reversal of 256486578 is 875684652.

It is a happy number.

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 256486578.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68823 + ... + 72453.

It is an arithmetic number, because the mean of its divisors is an integer number (16382136).

Almost surely, 2^256486578 is an apocalyptic number.

256486578 is an abundant number, since it is smaller than the sum of its proper divisors (267741774).

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

256486578 is a wasteful number, since it uses less digits than its factorization.

256486578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890.

The product of its digits is 3225600, while the sum is 51.

The square root of 256486578 is about 16015.1983440730. The cubic root of 256486578 is about 635.3624549451.

The spelling of 256486578 in words is "two hundred fifty-six million, four hundred eighty-six thousand, five hundred seventy-eight".