256406874 has 8 divisors (see below), whose sum is σ = 512813760. Its totient is φ = 85468956.

The previous prime is 256406867. The next prime is 256406897. The reversal of 256406874 is 478604652.

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

256406874 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, 21367234 + ... + 21367245.

It is an arithmetic number, because the mean of its divisors is an integer number (64101720).

Almost surely, 2^256406874 is an apocalyptic number.

256406874 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.

256406874 is a wasteful number, since it uses less digits than its factorization.

256406874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42734484.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 256406874 is about 16012.7097644340. The cubic root of 256406874 is about 635.2966345085.

The spelling of 256406874 in words is "two hundred fifty-six million, four hundred six thousand, eight hundred seventy-four".