28312523 has 4 divisors (see below), whose sum is σ = 28323240. Its totient is φ = 28301808.

The previous prime is 28312499. The next prime is 28312561. The reversal of 28312523 is 32521382.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28312523 - 2⁸ = 28312267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28312492 and 28312501.

It is not an unprimeable number, because it can be changed into a prime (28318523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1736 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (7080810).

Almost surely, 2^28312523 is an apocalyptic number.

28312523 is a deficient number, since it is larger than the sum of its proper divisors (10717).

28312523 is an equidigital number, since it uses as much as digits as its factorization.

28312523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716.

The product of its digits is 2880, while the sum is 26.

The square root of 28312523 is about 5320.9513247163. The cubic root of 28312523 is about 304.7844862914.

The spelling of 28312523 in words is "twenty-eight million, three hundred twelve thousand, five hundred twenty-three".