256607 has 4 divisors (see below), whose sum is σ = 276360. Its totient is φ = 236856.

The previous prime is 256603. The next prime is 256609. The reversal of 256607 is 706652.

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 256607 - 2² = 256603 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3 and base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256603) by changing a digit.

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, 9857 + ... + 9882.

It is an arithmetic number, because the mean of its divisors is an integer number (69090).

2²⁵⁶⁶⁰⁷ is an apocalyptic number.

256607 is a deficient number, since it is larger than the sum of its proper divisors (19753).

256607 is a wasteful number, since it uses less digits than its factorization.

256607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19752.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 256607 is about 506.5639150196. The cubic root of 256607 is about 63.5461874893.

The spelling of 256607 in words is "two hundred fifty-six thousand, six hundred seven".