256388867 has 8 divisors (see below), whose sum is σ = 300162912. Its totient is φ = 214401600.

The previous prime is 256388851. The next prime is 256388893. The reversal of 256388867 is 768883652.

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

It is not a de Polignac number, because 256388867 - 2⁴ = 256388851 is a prime.

It is a super-2 number, since 2×256388867² = 131470502243087378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256388827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446384 + ... + 446957.

It is an arithmetic number, because the mean of its divisors is an integer number (37520364).

Almost surely, 2^256388867 is an apocalyptic number.

256388867 is a deficient number, since it is larger than the sum of its proper divisors (43774045).

256388867 is an equidigital number, since it uses as much as digits as its factorization.

256388867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893389.

The product of its digits is 3870720, while the sum is 53.

The square root of 256388867 is about 16012.1474824584. The cubic root of 256388867 is about 635.2817622417.

The spelling of 256388867 in words is "two hundred fifty-six million, three hundred eighty-eight thousand, eight hundred sixty-seven".