256590 has 24 divisors (see below), whose sum is σ = 667368. Its totient is φ = 68400.

The previous prime is 256589. The next prime is 256603. The reversal of 256590 is 95652.

256590 is a `hidden beast` number, since 2 + 5 + 659 + 0 = 666.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256590.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1336 + ... + 1515.

It is an arithmetic number, because the mean of its divisors is an integer number (27807).

2²⁵⁶⁵⁹⁰ is an apocalyptic number.

256590 is an abundant number, since it is smaller than the sum of its proper divisors (410778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256590 is a wasteful number, since it uses less digits than its factorization.

256590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 256590 is about 506.5471350230. The cubic root of 256590 is about 63.5447841643.

The spelling of 256590 in words is "two hundred fifty-six thousand, five hundred ninety".