256208285 has 4 divisors (see below), whose sum is σ = 307449948. Its totient is φ = 204966624.

The previous prime is 256208279. The next prime is 256208291. The reversal of 256208285 is 582802652.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (256208279) and next prime (256208291).

It can be written as a sum of positive squares in 2 ways, for example, as 78092569 + 178115716 = 8837^2 + 13346^2 .

It is a cyclic number.

It is not a de Polignac number, because 256208285 - 2⁴ = 256208269 is a prime.

It is a Duffinian number.

It is a Curzon 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, 25620824 + ... + 25620833.

It is an arithmetic number, because the mean of its divisors is an integer number (76862487).

Almost surely, 2^256208285 is an apocalyptic number.

It is an amenable number.

256208285 is a deficient number, since it is larger than the sum of its proper divisors (51241663).

256208285 is an equidigital number, since it uses as much as digits as its factorization.

256208285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51241662.

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 256208285 is about 16006.5075828552. The cubic root of 256208285 is about 635.1325781830.

The spelling of 256208285 in words is "two hundred fifty-six million, two hundred eight thousand, two hundred eighty-five".