256603285 has 4 divisors (see below), whose sum is σ = 307923948. Its totient is φ = 205282624.

The previous prime is 256603283. The next prime is 256603307. The reversal of 256603285 is 582306652.

It is a happy number.

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 186076881 + 70526404 = 13641^2 + 8398^2 .

It is a cyclic number.

It is not a de Polignac number, because 256603285 - 2¹ = 256603283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256603283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25660324 + ... + 25660333.

It is an arithmetic number, because the mean of its divisors is an integer number (76980987).

Almost surely, 2^256603285 is an apocalyptic number.

It is an amenable number.

256603285 is a deficient number, since it is larger than the sum of its proper divisors (51320663).

256603285 is an equidigital number, since it uses as much as digits as its factorization.

256603285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51320662.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 256603285 is about 16018.8415623602. The cubic root of 256603285 is about 635.4588082678.

The spelling of 256603285 in words is "two hundred fifty-six million, six hundred three thousand, two hundred eighty-five".