256603647 has 16 divisors (see below), whose sum is σ = 354787328. Its totient is φ = 164795040.

The previous prime is 256603631. The next prime is 256603651. The reversal of 256603647 is 746306652.

It is not a de Polignac number, because 256603647 - 2⁴ = 256603631 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 (256603147) 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, 14553 + ... + 26925.

It is an arithmetic number, because the mean of its divisors is an integer number (22174208).

Almost surely, 2^256603647 is an apocalyptic number.

256603647 is a deficient number, since it is larger than the sum of its proper divisors (98183681).

256603647 is a wasteful number, since it uses less digits than its factorization.

256603647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12630.

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 256603647 is about 16018.8528615504. The cubic root of 256603647 is about 635.4591070896.

The spelling of 256603647 in words is "two hundred fifty-six million, six hundred three thousand, six hundred forty-seven".