321728396 has 24 divisors (see below), whose sum is σ = 624282960. Its totient is φ = 143841600.

The previous prime is 321728389. The next prime is 321728401. The reversal of 321728396 is 693827123.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57251 + ... + 62618.

It is an arithmetic number, because the mean of its divisors is an integer number (26011790).

Almost surely, 2^321728396 is an apocalyptic number.

It is an amenable number.

321728396 is a deficient number, since it is larger than the sum of its proper divisors (302554564).

321728396 is a wasteful number, since it uses less digits than its factorization.

321728396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119945 (or 119943 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 321728396 is about 17936.7888987968. The cubic root of 321728396 is about 685.2196329827.

It can be divided in two parts, 3217 and 28396, that added together give a palindrome (31613).

The spelling of 321728396 in words is "three hundred twenty-one million, seven hundred twenty-eight thousand, three hundred ninety-six".