256530705 has 16 divisors (see below), whose sum is σ = 411633600. Its totient is φ = 136421568.

The previous prime is 256530671. The next prime is 256530721. The reversal of 256530705 is 507035652.

It is a de Polignac number, because none of the positive numbers 2^k-256530705 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 19267 + ... + 29736.

It is an arithmetic number, because the mean of its divisors is an integer number (25727100).

Almost surely, 2^256530705 is an apocalyptic number.

It is an amenable number.

256530705 is a deficient number, since it is larger than the sum of its proper divisors (155102895).

256530705 is a wasteful number, since it uses less digits than its factorization.

256530705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49360.

The product of its (nonzero) digits is 31500, while the sum is 33.

The square root of 256530705 is about 16016.5759449390. The cubic root of 256530705 is about 635.3988896409.

The spelling of 256530705 in words is "two hundred fifty-six million, five hundred thirty thousand, seven hundred five".