256803025 has 12 divisors (see below), whose sum is σ = 318927132. Its totient is φ = 205125440.

The previous prime is 256803013. The next prime is 256803059. The reversal of 256803025 is 520308652.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 51969681 + 204833344 = 7209^2 + 14312^2 .

It is not a de Polignac number, because 256803025 - 2¹³ = 256794833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9339 + ... + 24511.

It is an arithmetic number, because the mean of its divisors is an integer number (26577261).

Almost surely, 2^256803025 is an apocalyptic number.

256803025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256803025 is a deficient number, since it is larger than the sum of its proper divisors (62124107).

256803025 is a wasteful number, since it uses less digits than its factorization.

256803025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15860 (or 15855 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 256803025 is about 16025.0748828204. The cubic root of 256803025 is about 635.6236458865.

The spelling of 256803025 in words is "two hundred fifty-six million, eight hundred three thousand, twenty-five".