256328089 has 4 divisors (see below), whose sum is σ = 256505956. Its totient is φ = 256150224.

The previous prime is 256328047. The next prime is 256328113. The reversal of 256328089 is 980823652.

256328089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172055689 + 84272400 = 13117^2 + 9180^2 .

It is a cyclic number.

It is not a de Polignac number, because 256328089 - 2⁷ = 256327961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256328789) 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, 86754 + ... + 89659.

It is an arithmetic number, because the mean of its divisors is an integer number (64126489).

Almost surely, 2^256328089 is an apocalyptic number.

It is an amenable number.

256328089 is a deficient number, since it is larger than the sum of its proper divisors (177867).

256328089 is a wasteful number, since it uses less digits than its factorization.

256328089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177866.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 256328089 is about 16010.2494983682. The cubic root of 256328089 is about 635.2315595857.

The spelling of 256328089 in words is "two hundred fifty-six million, three hundred twenty-eight thousand, eighty-nine".