256861888 has 28 divisors (see below), whose sum is σ = 516702040. Its totient is φ = 126669312.

The previous prime is 256861873. The next prime is 256861889. The reversal of 256861888 is 888168652.

It is not an unprimeable number, because it can be changed into a prime (256861889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22818 + ... + 32161.

Almost surely, 2^256861888 is an apocalyptic number.

It is an amenable number.

256861888 is an abundant number, since it is smaller than the sum of its proper divisors (259840152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256861888 is an equidigital number, since it uses as much as digits as its factorization.

256861888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55064 (or 55054 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 52.

The square root of 256861888 is about 16026.9113680709. The cubic root of 256861888 is about 635.6722069142.

The spelling of 256861888 in words is "two hundred fifty-six million, eight hundred sixty-one thousand, eight hundred eighty-eight".