256985875 has 16 divisors (see below), whose sum is σ = 321381216. Its totient is φ = 205164000.

The previous prime is 256985873. The next prime is 256985879. The reversal of 256985875 is 578589652.

256985875 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256985875 - 2¹ = 256985873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256985873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67780 + ... + 71470.

It is an arithmetic number, because the mean of its divisors is an integer number (20086326).

Almost surely, 2^256985875 is an apocalyptic number.

256985875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256985875 is a deficient number, since it is larger than the sum of its proper divisors (64395341).

256985875 is an equidigital number, since it uses as much as digits as its factorization.

256985875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263 (or 4253 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 55.

The square root of 256985875 is about 16030.7789891820. The cubic root of 256985875 is about 635.7744699274.

The spelling of 256985875 in words is "two hundred fifty-six million, nine hundred eighty-five thousand, eight hundred seventy-five".