256866876 has 120 divisors (see below), whose sum is σ = 788428256. Its totient is φ = 71383680.

The previous prime is 256866851. The next prime is 256866881. The reversal of 256866876 is 678668652.

256866876 is a `hidden beast` number, since 2 + 568 + 6 + 6 + 8 + 76 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 82386 + ... + 85446.

Almost surely, 2^256866876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256866876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394214128).

256866876 is an abundant number, since it is smaller than the sum of its proper divisors (531561380).

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

256866876 is a wasteful number, since it uses less digits than its factorization.

256866876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3110 counting only the distinct ones).

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

The square root of 256866876 is about 16027.0669805801. The cubic root of 256866876 is about 635.6763215929.

The spelling of 256866876 in words is "two hundred fifty-six million, eight hundred sixty-six thousand, eight hundred seventy-six".