256734605 has 4 divisors (see below), whose sum is σ = 308081532. Its totient is φ = 205387680.

The previous prime is 256734581. The next prime is 256734613. The reversal of 256734605 is 506437652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200873929 + 55860676 = 14173^2 + 7474^2 .

It is not a de Polignac number, because 256734605 - 2¹⁶ = 256669069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 25673456 + ... + 25673465.

It is an arithmetic number, because the mean of its divisors is an integer number (77020383).

Almost surely, 2^256734605 is an apocalyptic number.

It is an amenable number.

256734605 is a deficient number, since it is larger than the sum of its proper divisors (51346927).

256734605 is an equidigital number, since it uses as much as digits as its factorization.

256734605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51346926.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 256734605 is about 16022.9399611931. The cubic root of 256734605 is about 635.5671911612.

The spelling of 256734605 in words is "two hundred fifty-six million, seven hundred thirty-four thousand, six hundred five".