256587847 has 2 divisors, whose sum is σ = 256587848. Its totient is φ = 256587846.

The previous prime is 256587841. The next prime is 256587871. The reversal of 256587847 is 748785652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256587847 - 2⁷ = 256587719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256587794 and 256587803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256587841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128293923 + 128293924.

It is an arithmetic number, because the mean of its divisors is an integer number (128293924).

Almost surely, 2^256587847 is an apocalyptic number.

256587847 is a deficient number, since it is larger than the sum of its proper divisors (1).

256587847 is an equidigital number, since it uses as much as digits as its factorization.

256587847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3763200, while the sum is 52.

The square root of 256587847 is about 16018.3596850614. The cubic root of 256587847 is about 635.4460643288.

The spelling of 256587847 in words is "two hundred fifty-six million, five hundred eighty-seven thousand, eight hundred forty-seven".