28443 has 8 divisors (see below), whose sum is σ = 40000. Its totient is φ = 17928.

The previous prime is 28439. The next prime is 28447. The reversal of 28443 is 34482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28439) and next prime (28447).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28443 - 2² = 28439 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28443.

It is not an unprimeable number, because it can be changed into a prime (28447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193 + ... + 306.

It is an arithmetic number, because the mean of its divisors is an integer number (5000).

2²⁸⁴⁴³ is an apocalyptic number.

28443 is a deficient number, since it is larger than the sum of its proper divisors (11557).

28443 is a wasteful number, since it uses less digits than its factorization.

28443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521.

The product of its digits is 768, while the sum is 21.

The square root of 28443 is about 168.6505262369. The cubic root of 28443 is about 30.5251964147.

The spelling of 28443 in words is "twenty-eight thousand, four hundred forty-three".