256342285 has 4 divisors (see below), whose sum is σ = 307610748. Its totient is φ = 205073824.

The previous prime is 256342267. The next prime is 256342297. The reversal of 256342285 is 582243652.

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 189282564 + 67059721 = 13758^2 + 8189^2 .

It is a cyclic number.

It is not a de Polignac number, because 256342285 - 2⁷ = 256342157 is a prime.

It is a super-2 number, since 2×256342285² = 131422734158042450, 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, 25634224 + ... + 25634233.

It is an arithmetic number, because the mean of its divisors is an integer number (76902687).

Almost surely, 2^256342285 is an apocalyptic number.

It is an amenable number.

256342285 is a deficient number, since it is larger than the sum of its proper divisors (51268463).

256342285 is an equidigital number, since it uses as much as digits as its factorization.

256342285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51268462.

The product of its digits is 115200, while the sum is 37.

The square root of 256342285 is about 16010.6928332287. The cubic root of 256342285 is about 635.2432861985.

The spelling of 256342285 in words is "two hundred fifty-six million, three hundred forty-two thousand, two hundred eighty-five".