28423 has 4 divisors (see below), whose sum is σ = 29128. Its totient is φ = 27720.

The previous prime is 28411. The next prime is 28429. The reversal of 28423 is 32482.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28423 - 2¹³ = 20231 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 8³ + 4 + 2¹³ + 3⁹ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28429) 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, 288 + ... + 373.

It is an arithmetic number, because the mean of its divisors is an integer number (7282).

2²⁸⁴²³ is an apocalyptic number.

28423 is a deficient number, since it is larger than the sum of its proper divisors (705).

28423 is an equidigital number, since it uses as much as digits as its factorization.

28423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its digits is 384, while the sum is 19.

The square root of 28423 is about 168.5912215983. The cubic root of 28423 is about 30.5180400309.

The spelling of 28423 in words is "twenty-eight thousand, four hundred twenty-three".