256704223 has 2 divisors, whose sum is σ = 256704224. Its totient is φ = 256704222.

The previous prime is 256704209. The next prime is 256704251. The reversal of 256704223 is 322407652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256704223 - 2¹⁷ = 256573151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256704293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128352111 + 128352112.

It is an arithmetic number, because the mean of its divisors is an integer number (128352112).

Almost surely, 2^256704223 is an apocalyptic number.

256704223 is a deficient number, since it is larger than the sum of its proper divisors (1).

256704223 is an equidigital number, since it uses as much as digits as its factorization.

256704223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 256704223 is about 16021.9918549474. The cubic root of 256704223 is about 635.5421191429.

The spelling of 256704223 in words is "two hundred fifty-six million, seven hundred four thousand, two hundred twenty-three".