28311522023 has 4 divisors (see below), whose sum is σ = 28913894880. Its totient is φ = 27709149168.

The previous prime is 28311521939. The next prime is 28311522047. The reversal of 28311522023 is 32022511382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32022511382 = 2 ⋅16011255691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28311522023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311522823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301186358 + ... + 301186451.

It is an arithmetic number, because the mean of its divisors is an integer number (7228473720).

Almost surely, 2^28311522023 is an apocalyptic number.

28311522023 is a deficient number, since it is larger than the sum of its proper divisors (602372857).

28311522023 is an equidigital number, since it uses as much as digits as its factorization.

28311522023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602372856.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 28311522023 in words is "twenty-eight billion, three hundred eleven million, five hundred twenty-two thousand, twenty-three".