256687063 has 8 divisors (see below), whose sum is σ = 272801520. Its totient is φ = 240685440.

The previous prime is 256687031. The next prime is 256687103. The reversal of 256687063 is 360786652.

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 256687063 - 2⁵ = 256687031 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 (256687363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23493 + ... + 32638.

It is an arithmetic number, because the mean of its divisors is an integer number (34100190).

Almost surely, 2^256687063 is an apocalyptic number.

256687063 is a deficient number, since it is larger than the sum of its proper divisors (16114457).

256687063 is a wasteful number, since it uses less digits than its factorization.

256687063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56417.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 256687063 is about 16021.4563320567. The cubic root of 256687063 is about 635.5279573894.

The spelling of 256687063 in words is "two hundred fifty-six million, six hundred eighty-seven thousand, sixty-three".