256328811 has 12 divisors (see below), whose sum is σ = 374414040. Its totient is φ = 168965280.

The previous prime is 256328803. The next prime is 256328857. The reversal of 256328811 is 118823652.

It is a happy number.

256328811 is a `hidden beast` number, since 2 + 5 + 632 + 8 + 8 + 11 = 666.

It is not a de Polignac number, because 256328811 - 2³ = 256328803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256328881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159205 + ... + 160806.

It is an arithmetic number, because the mean of its divisors is an integer number (31201170).

Almost surely, 2^256328811 is an apocalyptic number.

256328811 is a deficient number, since it is larger than the sum of its proper divisors (118085229).

256328811 is a wasteful number, since it uses less digits than its factorization.

256328811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320106 (or 320103 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 256328811 is about 16010.2720464082. The cubic root of 256328811 is about 635.2321560046.

It can be divided in two parts, 25632 and 8811, that added together give a palindrome (34443).

The spelling of 256328811 in words is "two hundred fifty-six million, three hundred twenty-eight thousand, eight hundred eleven".