256617226 has 4 divisors (see below), whose sum is σ = 384925842. Its totient is φ = 128308612.

The previous prime is 256617223. The next prime is 256617247. The reversal of 256617226 is 622716652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 256032001 + 585225 = 16001^2 + 765^2 .

It is not an unprimeable number, because it can be changed into a prime (256617223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64154305 + ... + 64154308.

Almost surely, 2^256617226 is an apocalyptic number.

256617226 is a deficient number, since it is larger than the sum of its proper divisors (128308616).

256617226 is a wasteful number, since it uses less digits than its factorization.

256617226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128308615.

The product of its digits is 60480, while the sum is 37.

The square root of 256617226 is about 16019.2767002758. The cubic root of 256617226 is about 635.4703160067.

The spelling of 256617226 in words is "two hundred fifty-six million, six hundred seventeen thousand, two hundred twenty-six".