28321823 has 4 divisors (see below), whose sum is σ = 28333080. Its totient is φ = 28310568.

The previous prime is 28321819. The next prime is 28321831. The reversal of 28321823 is 32812382.

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 28321823 - 2² = 28321819 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 (28321123) 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, 68 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (7083270).

Almost surely, 2^28321823 is an apocalyptic number.

28321823 is a deficient number, since it is larger than the sum of its proper divisors (11257).

28321823 is an equidigital number, since it uses as much as digits as its factorization.

28321823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11256.

The product of its digits is 4608, while the sum is 29.

The square root of 28321823 is about 5321.8251568423. The cubic root of 28321823 is about 304.8178541574.

The spelling of 28321823 in words is "twenty-eight million, three hundred twenty-one thousand, eight hundred twenty-three".