256668706 has 8 divisors (see below), whose sum is σ = 440003520. Its totient is φ = 110000868.

The previous prime is 256668697. The next prime is 256668719. The reversal of 256668706 is 607866652.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9166726 + ... + 9166753.

It is an arithmetic number, because the mean of its divisors is an integer number (55000440).

Almost surely, 2^256668706 is an apocalyptic number.

256668706 is a deficient number, since it is larger than the sum of its proper divisors (183334814).

256668706 is a wasteful number, since it uses less digits than its factorization.

256668706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18333488.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 256668706 is about 16020.8834338185. The cubic root of 256668706 is about 635.5128070806.

The spelling of 256668706 in words is "two hundred fifty-six million, six hundred sixty-eight thousand, seven hundred six".