256708747 has 2 divisors, whose sum is σ = 256708748. Its totient is φ = 256708746.

The previous prime is 256708723. The next prime is 256708757. The reversal of 256708747 is 747807652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256708747 - 2¹⁹ = 256184459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256708697 and 256708706.

It is not a weakly prime, because it can be changed into another prime (256708717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128354373 + 128354374.

It is an arithmetic number, because the mean of its divisors is an integer number (128354374).

Almost surely, 2^256708747 is an apocalyptic number.

256708747 is a deficient number, since it is larger than the sum of its proper divisors (1).

256708747 is an equidigital number, since it uses as much as digits as its factorization.

256708747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658560, while the sum is 46.

The square root of 256708747 is about 16022.1330352734. The cubic root of 256708747 is about 635.5458525910.

The spelling of 256708747 in words is "two hundred fifty-six million, seven hundred eight thousand, seven hundred forty-seven".