256017263 has 8 divisors (see below), whose sum is σ = 271218960. Its totient is φ = 240831360.

The previous prime is 256017259. The next prime is 256017269. The reversal of 256017263 is 362710652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256017263 - 2² = 256017259 is a prime.

It is a super-2 number, since 2×256017263² = 131089677908022338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256017269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53093 + ... + 57713.

It is an arithmetic number, because the mean of its divisors is an integer number (33902370).

Almost surely, 2^256017263 is an apocalyptic number.

256017263 is a deficient number, since it is larger than the sum of its proper divisors (15201697).

256017263 is a wasteful number, since it uses less digits than its factorization.

256017263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 256017263 is about 16000.5394596557. The cubic root of 256017263 is about 634.9746930208.

The spelling of 256017263 in words is "two hundred fifty-six million, seventeen thousand, two hundred sixty-three".