256895009 has 8 divisors (see below), whose sum is σ = 295396800. Its totient is φ = 218843856.

The previous prime is 256894993. The next prime is 256895011. The reversal of 256895009 is 900598652.

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

It is not a de Polignac number, because 256895009 - 2⁴ = 256894993 is a prime.

It is a super-2 number, since 2×256895009² = 131990091298220162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256895039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111434 + ... + 113715.

It is an arithmetic number, because the mean of its divisors is an integer number (36924600).

Almost surely, 2^256895009 is an apocalyptic number.

It is an amenable number.

256895009 is a deficient number, since it is larger than the sum of its proper divisors (38501791).

256895009 is a wasteful number, since it uses less digits than its factorization.

256895009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225319.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 256895009 is about 16027.9446280551. The cubic root of 256895009 is about 635.6995279445.

The spelling of 256895009 in words is "two hundred fifty-six million, eight hundred ninety-five thousand, nine".