256987834 has 16 divisors (see below), whose sum is σ = 395915040. Its totient is φ = 125059600.

The previous prime is 256987789. The next prime is 256987859. The reversal of 256987834 is 438789652.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137 + ... + 22699.

It is an arithmetic number, because the mean of its divisors is an integer number (24744690).

Almost surely, 2^256987834 is an apocalyptic number.

256987834 is a deficient number, since it is larger than the sum of its proper divisors (138927206).

256987834 is a wasteful number, since it uses less digits than its factorization.

256987834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21725.

The product of its digits is 2903040, while the sum is 52.

The square root of 256987834 is about 16030.8400902760. The cubic root of 256987834 is about 635.7760854235.

The spelling of 256987834 in words is "two hundred fifty-six million, nine hundred eighty-seven thousand, eight hundred thirty-four".