321678128 has 40 divisors (see below), whose sum is σ = 640479840. Its totient is φ = 156418560.

The previous prime is 321678107. The next prime is 321678163. The reversal of 321678128 is 821876123.

It is a junction number, because it is equal to n+sod(n) for n = 321678091 and 321678100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287426 + ... + 288542.

It is an arithmetic number, because the mean of its divisors is an integer number (16011996).

Almost surely, 2^321678128 is an apocalyptic number.

It is an amenable number.

321678128 is a deficient number, since it is larger than the sum of its proper divisors (318801712).

321678128 is a wasteful number, since it uses less digits than its factorization.

321678128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605 (or 1599 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 321678128 is about 17935.3875899017. The cubic root of 321678128 is about 685.1839440652.

The spelling of 321678128 in words is "three hundred twenty-one million, six hundred seventy-eight thousand, one hundred twenty-eight".