28432 has 10 divisors (see below), whose sum is σ = 55118. Its totient is φ = 14208.

The previous prime is 28429. The next prime is 28433. The reversal of 28432 is 23482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24336 + 4096 = 156^2 + 64^2 .

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 873 + ... + 904.

2²⁸⁴³² is an apocalyptic number.

It is an amenable number.

28432 is a deficient number, since it is larger than the sum of its proper divisors (26686).

28432 is a wasteful number, since it uses less digits than its factorization.

28432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785 (or 1779 counting only the distinct ones).

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

The square root of 28432 is about 168.6179112669. The cubic root of 28432 is about 30.5212608189.

Subtracting from 28432 its reverse (23482), we obtain a triangular number (4950 = T₉₉).

The spelling of 28432 in words is "twenty-eight thousand, four hundred thirty-two".