28328 has 8 divisors (see below), whose sum is σ = 53130. Its totient is φ = 14160.

The previous prime is 28319. The next prime is 28349. The reversal of 28328 is 82382.

It can be written as a sum of positive squares in only one way, i.e., 24964 + 3364 = 158^2 + 58^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28328.

It is an unprimeable number.

28328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1763 + ... + 1778.

2²⁸³²⁸ is an apocalyptic number.

It is an amenable number.

28328 is a deficient number, since it is larger than the sum of its proper divisors (24802).

28328 is a wasteful number, since it uses less digits than its factorization.

28328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547 (or 3543 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 28328 is about 168.3092391998. The cubic root of 28328 is about 30.4840012842.

The spelling of 28328 in words is "twenty-eight thousand, three hundred twenty-eight".