256015866 has 8 divisors (see below), whose sum is σ = 512031744. Its totient is φ = 85338620.

The previous prime is 256015813. The next prime is 256015901. The reversal of 256015866 is 668510652.

It is a sphenic number, since it is the product of 3 distinct primes.

256015866 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21334650 + ... + 21334661.

It is an arithmetic number, because the mean of its divisors is an integer number (64003968).

Almost surely, 2^256015866 is an apocalyptic number.

256015866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256015866 is a wasteful number, since it uses less digits than its factorization.

256015866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42669316.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 256015866 is about 16000.4958048180. The cubic root of 256015866 is about 634.9735380710.

The spelling of 256015866 in words is "two hundred fifty-six million, fifteen thousand, eight hundred sixty-six".