256760217 has 12 divisors (see below), whose sum is σ = 423858240. Its totient is φ = 146720088.

The previous prime is 256760213. The next prime is 256760233. The reversal of 256760217 is 712067652.

It is not a de Polignac number, because 256760217 - 2² = 256760213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256760213) 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 11 ways as a sum of consecutive naturals, for example, 2037717 + ... + 2037842.

It is an arithmetic number, because the mean of its divisors is an integer number (35321520).

Almost surely, 2^256760217 is an apocalyptic number.

It is an amenable number.

256760217 is a deficient number, since it is larger than the sum of its proper divisors (167098023).

256760217 is a wasteful number, since it uses less digits than its factorization.

256760217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075572 (or 4075569 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 256760217 is about 16023.7391703684. The cubic root of 256760217 is about 635.5883253147.

The spelling of 256760217 in words is "two hundred fifty-six million, seven hundred sixty thousand, two hundred seventeen".