256081258 has 16 divisors (see below), whose sum is σ = 388644480. Its totient is φ = 126538000.

The previous prime is 256081253. The next prime is 256081271. The reversal of 256081258 is 852180652.

It is a super-2 number, since 2×256081258² = 131155221397725128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256081253) 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 7 ways as a sum of consecutive naturals, for example, 168723 + ... + 170233.

It is an arithmetic number, because the mean of its divisors is an integer number (24290280).

Almost surely, 2^256081258 is an apocalyptic number.

256081258 is a deficient number, since it is larger than the sum of its proper divisors (132563222).

256081258 is a wasteful number, since it uses less digits than its factorization.

256081258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 256081258 is about 16002.5391110286. The cubic root of 256081258 is about 635.0275954693.

The spelling of 256081258 in words is "two hundred fifty-six million, eighty-one thousand, two hundred fifty-eight".