256791033 has 16 divisors (see below), whose sum is σ = 388527360. Its totient is φ = 167550768.

The previous prime is 256791013. The next prime is 256791049. The reversal of 256791033 is 330197652.

256791033 is a `hidden beast` number, since 2 + 567 + 91 + 0 + 3 + 3 = 666.

It is not a de Polignac number, because 256791033 - 2¹⁴ = 256774649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256791013) 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 15 ways as a sum of consecutive naturals, for example, 99910 + ... + 102447.

It is an arithmetic number, because the mean of its divisors is an integer number (24282960).

Almost surely, 2^256791033 is an apocalyptic number.

It is an amenable number.

256791033 is a deficient number, since it is larger than the sum of its proper divisors (131736327).

256791033 is a wasteful number, since it uses less digits than its factorization.

256791033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202413 (or 202407 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 256791033 is about 16024.7007148340. The cubic root of 256791033 is about 635.6137517697.

The spelling of 256791033 in words is "two hundred fifty-six million, seven hundred ninety-one thousand, thirty-three".