256456285 has 4 divisors (see below), whose sum is σ = 307747548. Its totient is φ = 205165024.

The previous prime is 256456253. The next prime is 256456327. The reversal of 256456285 is 582654652.

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 108930969 + 147525316 = 10437^2 + 12146^2 .

It is a cyclic number.

It is not a de Polignac number, because 256456285 - 2⁵ = 256456253 is a prime.

It is a super-2 number, since 2×256456285² = 131539652232002450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25645624 + ... + 25645633.

It is an arithmetic number, because the mean of its divisors is an integer number (76936887).

Almost surely, 2^256456285 is an apocalyptic number.

It is an amenable number.

256456285 is a deficient number, since it is larger than the sum of its proper divisors (51291263).

256456285 is an equidigital number, since it uses as much as digits as its factorization.

256456285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51291262.

The product of its digits is 576000, while the sum is 43.

The square root of 256456285 is about 16014.2525582682. The cubic root of 256456285 is about 635.3374402604.

The spelling of 256456285 in words is "two hundred fifty-six million, four hundred fifty-six thousand, two hundred eighty-five".