28111821083 has 4 divisors (see below), whose sum is σ = 28765584408. Its totient is φ = 27458057760.

The previous prime is 28111821043. The next prime is 28111821097. The reversal of 28111821083 is 38012811182.

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

It is a cyclic number.

It is not a de Polignac number, because 28111821083 - 2²⁶ = 28044712219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28111821043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326881598 + ... + 326881683.

It is an arithmetic number, because the mean of its divisors is an integer number (7191396102).

Almost surely, 2^28111821083 is an apocalyptic number.

28111821083 is a deficient number, since it is larger than the sum of its proper divisors (653763325).

28111821083 is an equidigital number, since it uses as much as digits as its factorization.

28111821083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653763324.

The product of its (nonzero) digits is 6144, while the sum is 35.

Subtracting 28111821083 from its reverse (38012811182), we obtain a palindrome (9900990099).

The spelling of 28111821083 in words is "twenty-eight billion, one hundred eleven million, eight hundred twenty-one thousand, eighty-three".