256286987 has 8 divisors (see below), whose sum is σ = 280842240. Its totient is φ = 231941160.

The previous prime is 256286963. The next prime is 256287037. The reversal of 256286987 is 789682652.

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

It is not a de Polignac number, because 256286987 - 2⁸ = 256286731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256286287) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 49787 + ... + 54692.

It is an arithmetic number, because the mean of its divisors is an integer number (35105280).

Almost surely, 2^256286987 is an apocalyptic number.

256286987 is a deficient number, since it is larger than the sum of its proper divisors (24555253).

256286987 is a wasteful number, since it uses less digits than its factorization.

256286987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104713.

The product of its digits is 2903040, while the sum is 53.

The square root of 256286987 is about 16008.9658316832. The cubic root of 256286987 is about 635.1976048166.

The spelling of 256286987 in words is "two hundred fifty-six million, two hundred eighty-six thousand, nine hundred eighty-seven".