71328321 has 24 divisors (see below), whose sum is σ = 105019200. Its totient is φ = 46644000.

The previous prime is 71328319. The next prime is 71328329. The reversal of 71328321 is 12382317.

It is not a de Polignac number, because 71328321 - 2¹ = 71328319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71328329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118780 + ... + 119378.

It is an arithmetic number, because the mean of its divisors is an integer number (4375800).

Almost surely, 2^71328321 is an apocalyptic number.

It is an amenable number.

71328321 is a deficient number, since it is larger than the sum of its proper divisors (33690879).

71328321 is a wasteful number, since it uses less digits than its factorization.

71328321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 834 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 71328321 is about 8445.6095694745. The cubic root of 71328321 is about 414.7190647138.

The spelling of 71328321 in words is "seventy-one million, three hundred twenty-eight thousand, three hundred twenty-one".