256328 has 12 divisors (see below), whose sum is σ = 483315. Its totient is φ = 127448.

The previous prime is 256313. The next prime is 256337. The reversal of 256328 is 823652.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

256328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 128164 + 128164 = 358^2 + 358^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=358.

It is a d-powerful number, because it can be written as 2² + 5⁶ + 3¹¹ + 6⁶ + 2¹⁴ + 8³ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256297 and 256306.

It is an unprimeable number.

256328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1343 + ... + 1521.

256328 is a Friedman number, since it can be written as 8*(3^5-2^6)^2, using all its digits and the basic arithmetic operations.

2²⁵⁶³²⁸ is an apocalyptic number.

It is an amenable number.

256328 is a deficient number, since it is larger than the sum of its proper divisors (226987).

256328 is an equidigital number, since it uses as much as digits as its factorization.

256328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 181 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 256328 is about 506.2884553296. The cubic root of 256328 is about 63.5231486066.

The spelling of 256328 in words is "two hundred fifty-six thousand, three hundred twenty-eight".