256563426 has 16 divisors (see below), whose sum is σ = 586430784. Its totient is φ = 73303824.

The previous prime is 256563383. The next prime is 256563431. The reversal of 256563426 is 624365652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3054285 + ... + 3054368.

It is an arithmetic number, because the mean of its divisors is an integer number (36651924).

Almost surely, 2^256563426 is an apocalyptic number.

256563426 is an abundant number, since it is smaller than the sum of its proper divisors (329867358).

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

256563426 is a wasteful number, since it uses less digits than its factorization.

256563426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108665.

The product of its digits is 259200, while the sum is 39.

The square root of 256563426 is about 16017.5973853759. The cubic root of 256563426 is about 635.4259039551.

The spelling of 256563426 in words is "two hundred fifty-six million, five hundred sixty-three thousand, four hundred twenty-six".