28327824667321 has 3 divisors (see below), whose sum is σ = 28327829989711. Its totient is φ = 28327819344932.

The previous prime is 28327824667271. The next prime is 28327824667367. The reversal of 28327824667321 is 12376642872382.

The square root of 28327824667321 is 5322389.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2670155351721 + 25657669315600 = 1634061^2 + 5065340^2 .

It is not a de Polignac number, because 28327824667321 - 2¹³ = 28327824659129 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 28327824667321.

It is not an unprimeable number, because it can be changed into a prime (28327824667921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2661195 + ... + 7983583.

Almost surely, 2^{28327824667321} is an apocalyptic number.

28327824667321 is the 5322389-th square number.

28327824667321 is the 2661195-th centered octagonal number.

It is an amenable number.

28327824667321 is a deficient number, since it is larger than the sum of its proper divisors (5322390).

28327824667321 is an frugal number, since it uses more digits than its factorization.

28327824667321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10644778 (or 5322389 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 61.

The spelling of 28327824667321 in words is "twenty-eight trillion, three hundred twenty-seven billion, eight hundred twenty-four million, six hundred sixty-seven thousand, three hundred twenty-one".