28245566523 has 4 divisors (see below), whose sum is σ = 37660755368. Its totient is φ = 18830377680.

The previous prime is 28245566513. The next prime is 28245566539. The reversal of 28245566523 is 32566554282.

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

It is not a de Polignac number, because 28245566523 - 2²⁸ = 27977131067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28245566513) 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, 4707594418 + ... + 4707594423.

It is an arithmetic number, because the mean of its divisors is an integer number (9415188842).

Almost surely, 2^28245566523 is an apocalyptic number.

28245566523 is a deficient number, since it is larger than the sum of its proper divisors (9415188845).

28245566523 is an equidigital number, since it uses as much as digits as its factorization.

28245566523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9415188844.

The product of its digits is 3456000, while the sum is 48.

The spelling of 28245566523 in words is "twenty-eight billion, two hundred forty-five million, five hundred sixty-six thousand, five hundred twenty-three".