256790 has 8 divisors (see below), whose sum is σ = 462240. Its totient is φ = 102712.

The previous prime is 256771. The next prime is 256799. The reversal of 256790 is 97652.

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

It is a super-2 number, since 2×256790² = 131882208200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256799) by changing a digit.

256790 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 12830 + ... + 12849.

It is an arithmetic number, because the mean of its divisors is an integer number (57780).

2²⁵⁶⁷⁹⁰ is an apocalyptic number.

256790 is a deficient number, since it is larger than the sum of its proper divisors (205450).

256790 is a wasteful number, since it uses less digits than its factorization.

256790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25686.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 256790 is about 506.7445115638. The cubic root of 256790 is about 63.5612899469.

The spelling of 256790 in words is "two hundred fifty-six thousand, seven hundred ninety".