256705751 has 8 divisors (see below), whose sum is σ = 274647600. Its totient is φ = 239207040.

The previous prime is 256705727. The next prime is 256705753. The reversal of 256705751 is 157507652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256705751 - 2¹⁰ = 256704727 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 (256705753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109586 + ... + 111903.

It is an arithmetic number, because the mean of its divisors is an integer number (34330950).

Almost surely, 2^256705751 is an apocalyptic number.

256705751 is a deficient number, since it is larger than the sum of its proper divisors (17941849).

256705751 is a wasteful number, since it uses less digits than its factorization.

256705751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221569.

The product of its (nonzero) digits is 73500, while the sum is 38.

The square root of 256705751 is about 16022.0395393346. The cubic root of 256705751 is about 635.5433801356.

The spelling of 256705751 in words is "two hundred fifty-six million, seven hundred five thousand, seven hundred fifty-one".