256768671 has 4 divisors (see below), whose sum is σ = 342358232. Its totient is φ = 171179112.

The previous prime is 256768637. The next prime is 256768747. The reversal of 256768671 is 176867652.

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

It is not a de Polignac number, because 256768671 - 2¹⁵ = 256735903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256768671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256768601) 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, 42794776 + ... + 42794781.

It is an arithmetic number, because the mean of its divisors is an integer number (85589558).

Almost surely, 2^256768671 is an apocalyptic number.

256768671 is a deficient number, since it is larger than the sum of its proper divisors (85589561).

256768671 is an equidigital number, since it uses as much as digits as its factorization.

256768671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85589560.

The product of its digits is 846720, while the sum is 48.

The square root of 256768671 is about 16024.0029643033. The cubic root of 256768671 is about 635.5953009602.

The spelling of 256768671 in words is "two hundred fifty-six million, seven hundred sixty-eight thousand, six hundred seventy-one".