256228566 has 32 divisors (see below), whose sum is σ = 588470400. Its totient is φ = 73558080.

The previous prime is 256228541. The next prime is 256228571. The reversal of 256228566 is 665822652.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 100911 + ... + 103418.

It is an arithmetic number, because the mean of its divisors is an integer number (18389700).

Almost surely, 2^256228566 is an apocalyptic number.

256228566 is an abundant number, since it is smaller than the sum of its proper divisors (332241834).

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

256228566 is a wasteful number, since it uses less digits than its factorization.

256228566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204364.

The product of its digits is 345600, while the sum is 42.

The square root of 256228566 is about 16007.1410938993. The cubic root of 256228566 is about 635.1493364024.

It can be divided in two parts, 256 and 228566, that added together give a palindrome (228822).

The spelling of 256228566 in words is "two hundred fifty-six million, two hundred twenty-eight thousand, five hundred sixty-six".