256606 has 8 divisors (see below), whose sum is σ = 439920. Its totient is φ = 109968.

The previous prime is 256603. The next prime is 256609. The reversal of 256606 is 606652.

It is an interprime number because it is at equal distance from previous prime (256603) and next prime (256609).

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

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9151 + ... + 9178.

It is an arithmetic number, because the mean of its divisors is an integer number (54990).

2²⁵⁶⁶⁰⁶ is an apocalyptic number.

256606 is a deficient number, since it is larger than the sum of its proper divisors (183314).

256606 is a wasteful number, since it uses less digits than its factorization.

256606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18338.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 256606 is about 506.5629279764. The cubic root of 256606 is about 63.5461049425.

The spelling of 256606 in words is "two hundred fifty-six thousand, six hundred six".