256864846 has 8 divisors (see below), whose sum is σ = 440339760. Its totient is φ = 110084928.

The previous prime is 256864813. The next prime is 256864847. The reversal of 256864846 is 648468652.

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

It is a super-3 number, since 3×256864846³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 256864846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256864847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9173731 + ... + 9173758.

It is an arithmetic number, because the mean of its divisors is an integer number (55042470).

Almost surely, 2^256864846 is an apocalyptic number.

256864846 is a deficient number, since it is larger than the sum of its proper divisors (183474914).

256864846 is a wasteful number, since it uses less digits than its factorization.

256864846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18347498.

The product of its digits is 2211840, while the sum is 49.

The square root of 256864846 is about 16027.0036500901. The cubic root of 256864846 is about 635.6746470208.

The spelling of 256864846 in words is "two hundred fifty-six million, eight hundred sixty-four thousand, eight hundred forty-six".