321378863 has 16 divisors (see below), whose sum is σ = 385751520. Its totient is φ = 264508416.

The previous prime is 321378859. The next prime is 321378877. The reversal of 321378863 is 368873123.

It is a cyclic number.

It is not a de Polignac number, because 321378863 - 2² = 321378859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321378863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321378853) 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 15 ways as a sum of consecutive naturals, for example, 34070 + ... + 42467.

It is an arithmetic number, because the mean of its divisors is an integer number (24109470).

Almost surely, 2^321378863 is an apocalyptic number.

321378863 is a deficient number, since it is larger than the sum of its proper divisors (64372657).

321378863 is a wasteful number, since it uses less digits than its factorization.

321378863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76586.

The product of its digits is 145152, while the sum is 41.

The square root of 321378863 is about 17927.0427845755. The cubic root of 321378863 is about 684.9713970332.

The spelling of 321378863 in words is "three hundred twenty-one million, three hundred seventy-eight thousand, eight hundred sixty-three".