256856422 has 8 divisors (see below), whose sum is σ = 398570400. Its totient is φ = 123999624.

The previous prime is 256856381. The next prime is 256856437. The reversal of 256856422 is 224658652.

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

It is a congruent 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, 2214222 + ... + 2214337.

It is an arithmetic number, because the mean of its divisors is an integer number (49821300).

Almost surely, 2^256856422 is an apocalyptic number.

256856422 is a deficient number, since it is larger than the sum of its proper divisors (141713978).

256856422 is a wasteful number, since it uses less digits than its factorization.

256856422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428590.

The product of its digits is 230400, while the sum is 40.

The square root of 256856422 is about 16026.7408414812. The cubic root of 256856422 is about 635.6676978646.

The spelling of 256856422 in words is "two hundred fifty-six million, eight hundred fifty-six thousand, four hundred twenty-two".