256734617 has 8 divisors (see below), whose sum is σ = 259008480. Its totient is φ = 254469600.

The previous prime is 256734613. The next prime is 256734619. The reversal of 256734617 is 716437652.

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 256734617 - 2² = 256734613 is a prime.

It is a super-2 number, since 2×256734617² = 131825327132273378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256734613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64742 + ... + 68592.

It is an arithmetic number, because the mean of its divisors is an integer number (32376060).

Almost surely, 2^256734617 is an apocalyptic number.

It is an amenable number.

256734617 is a deficient number, since it is larger than the sum of its proper divisors (2273863).

256734617 is a wasteful number, since it uses less digits than its factorization.

256734617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423.

The product of its digits is 211680, while the sum is 41.

The square root of 256734617 is about 16022.9403356562. The cubic root of 256734617 is about 635.5672010635.

The spelling of 256734617 in words is "two hundred fifty-six million, seven hundred thirty-four thousand, six hundred seventeen".