256580767 has 4 divisors (see below), whose sum is σ = 258601216. Its totient is φ = 254560320.

The previous prime is 256580761. The next prime is 256580771. The reversal of 256580767 is 767085652.

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

It is a cyclic number.

It is not a de Polignac number, because 256580767 - 2³ = 256580759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256580761) 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 3 ways as a sum of consecutive naturals, for example, 1010034 + ... + 1010287.

It is an arithmetic number, because the mean of its divisors is an integer number (64650304).

Almost surely, 2^256580767 is an apocalyptic number.

256580767 is a deficient number, since it is larger than the sum of its proper divisors (2020449).

256580767 is a wasteful number, since it uses less digits than its factorization.

256580767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020448.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 256580767 is about 16018.1386871259. The cubic root of 256580767 is about 635.4402196775.

The spelling of 256580767 in words is "two hundred fifty-six million, five hundred eighty thousand, seven hundred sixty-seven".