256605273 has 32 divisors (see below), whose sum is σ = 398926080. Its totient is φ = 162708480.

The previous prime is 256605257. The next prime is 256605301. The reversal of 256605273 is 372506652.

It is a happy number.

256605273 is a `hidden beast` number, since 25 + 6 + 605 + 27 + 3 = 666.

It is not a de Polignac number, because 256605273 - 2⁴ = 256605257 is a prime.

It is a super-2 number, since 2×256605273² = 131692532262809058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256600273) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 118783 + ... + 120923.

It is an arithmetic number, because the mean of its divisors is an integer number (12466440).

Almost surely, 2^256605273 is an apocalyptic number.

256605273 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256605273 is a deficient number, since it is larger than the sum of its proper divisors (142320807).

256605273 is a wasteful number, since it uses less digits than its factorization.

256605273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2360 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 256605273 is about 16018.9036141679. The cubic root of 256605273 is about 635.4604493079.

The spelling of 256605273 in words is "two hundred fifty-six million, six hundred five thousand, two hundred seventy-three".