256886673 has 8 divisors (see below), whose sum is σ = 342611136. Its totient is φ = 171210000.

The previous prime is 256886657. The next prime is 256886681. The reversal of 256886673 is 376688652.

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

It is not a de Polignac number, because 256886673 - 2⁴ = 256886657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256886173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3423 + ... + 22923.

It is an arithmetic number, because the mean of its divisors is an integer number (42826392).

Almost surely, 2^256886673 is an apocalyptic number.

It is an amenable number.

256886673 is a deficient number, since it is larger than the sum of its proper divisors (85724463).

256886673 is a wasteful number, since it uses less digits than its factorization.

256886673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23895.

The product of its digits is 2903040, while the sum is 51.

The square root of 256886673 is about 16027.6845801257. The cubic root of 256886673 is about 635.6926519207.

The spelling of 256886673 in words is "two hundred fifty-six million, eight hundred eighty-six thousand, six hundred seventy-three".