28343513321 has 4 divisors (see below), whose sum is σ = 29835277200. Its totient is φ = 26851749444.

The previous prime is 28343513309. The next prime is 28343513351. The reversal of 28343513321 is 12331534382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28343513321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28343513351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745881911 + ... + 745881948.

It is an arithmetic number, because the mean of its divisors is an integer number (7458819300).

Almost surely, 2^28343513321 is an apocalyptic number.

It is an amenable number.

28343513321 is a deficient number, since it is larger than the sum of its proper divisors (1491763879).

28343513321 is a wasteful number, since it uses less digits than its factorization.

28343513321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491763878.

The product of its digits is 51840, while the sum is 35.

The spelling of 28343513321 in words is "twenty-eight billion, three hundred forty-three million, five hundred thirteen thousand, three hundred twenty-one".