256786866 has 48 divisors (see below), whose sum is σ = 637099008. Its totient is φ = 73224000.

The previous prime is 256786861. The next prime is 256786867. The reversal of 256786866 is 668687652.

256786866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256786861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74031 + ... + 77421.

It is an arithmetic number, because the mean of its divisors is an integer number (13272896).

Almost surely, 2^256786866 is an apocalyptic number.

256786866 is an abundant number, since it is smaller than the sum of its proper divisors (380312142).

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

256786866 is a wasteful number, since it uses less digits than its factorization.

256786866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007 (or 4004 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 256786866 is about 16024.5706962776. The cubic root of 256786866 is about 635.6103136735.

The spelling of 256786866 in words is "two hundred fifty-six million, seven hundred eighty-six thousand, eight hundred sixty-six".