256605707 has 4 divisors (see below), whose sum is σ = 256670856. Its totient is φ = 256540560.

The previous prime is 256605689. The next prime is 256605737. The reversal of 256605707 is 707506652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256605707 - 2⁸ = 256605451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256605737) 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 3 ways as a sum of consecutive naturals, for example, 26258 + ... + 34679.

It is an arithmetic number, because the mean of its divisors is an integer number (64167714).

Almost surely, 2^256605707 is an apocalyptic number.

256605707 is a deficient number, since it is larger than the sum of its proper divisors (65149).

256605707 is an equidigital number, since it uses as much as digits as its factorization.

256605707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65148.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 256605707 is about 16018.9171606573. The cubic root of 256605707 is about 635.4608075620.

The spelling of 256605707 in words is "two hundred fifty-six million, six hundred five thousand, seven hundred seven".