256570 has 8 divisors (see below), whose sum is σ = 461844. Its totient is φ = 102624.

The previous prime is 256567. The next prime is 256577. The reversal of 256570 is 75652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 249001 + 7569 = 499^2 + 87^2 .

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

It is not an unprimeable number, because it can be changed into a prime (256577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12819 + ... + 12838.

2²⁵⁶⁵⁷⁰ is an apocalyptic number.

256570 is a deficient number, since it is larger than the sum of its proper divisors (205274).

256570 is a wasteful number, since it uses less digits than its factorization.

256570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25664.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 256570 is about 506.5273931388. The cubic root of 256570 is about 63.5431331144.

The spelling of 256570 in words is "two hundred fifty-six thousand, five hundred seventy".