256644223 has 16 divisors (see below), whose sum is σ = 297277344. Its totient is φ = 218972160.

The previous prime is 256644203. The next prime is 256644239. The reversal of 256644223 is 322446652.

It is not a de Polignac number, because 256644223 - 2²¹ = 254547071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256644203) 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, 72511 + ... + 75967.

It is an arithmetic number, because the mean of its divisors is an integer number (18579834).

Almost surely, 2^256644223 is an apocalyptic number.

256644223 is a deficient number, since it is larger than the sum of its proper divisors (40633121).

256644223 is a wasteful number, since it uses less digits than its factorization.

256644223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882.

The product of its digits is 69120, while the sum is 34.

The square root of 256644223 is about 16020.1193191561. The cubic root of 256644223 is about 635.4925997674.

The spelling of 256644223 in words is "two hundred fifty-six million, six hundred forty-four thousand, two hundred twenty-three".