28321216841 has 4 divisors (see below), whose sum is σ = 29086655172. Its totient is φ = 27555778512.

The previous prime is 28321216829. The next prime is 28321216849. The reversal of 28321216841 is 14861212382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16526388025 + 11794828816 = 128555^2 + 108604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28321216841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28321216795 and 28321216804.

It is not an unprimeable number, because it can be changed into a prime (28321216849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382719110 + ... + 382719183.

It is an arithmetic number, because the mean of its divisors is an integer number (7271663793).

Almost surely, 2^28321216841 is an apocalyptic number.

It is an amenable number.

28321216841 is a deficient number, since it is larger than the sum of its proper divisors (765438331).

28321216841 is an equidigital number, since it uses as much as digits as its factorization.

28321216841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765438330.

The product of its digits is 36864, while the sum is 38.

The spelling of 28321216841 in words is "twenty-eight billion, three hundred twenty-one million, two hundred sixteen thousand, eight hundred forty-one".