28673 has 4 divisors (see below), whose sum is σ = 29268. Its totient is φ = 28080.

The previous prime is 28669. The next prime is 28687. The reversal of 28673 is 37682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16129 + 12544 = 127^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 28673 - 2² = 28669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (28603) 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, 218 + ... + 323.

It is an arithmetic number, because the mean of its divisors is an integer number (7317).

It is a Proth number, since it is equal to 7 ⋅ 2¹² + 1 and 7 < 2¹².

2²⁸⁶⁷³ is an apocalyptic number.

It is an amenable number.

28673 is a deficient number, since it is larger than the sum of its proper divisors (595).

28673 is an equidigital number, since it uses as much as digits as its factorization.

28673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594.

The product of its digits is 2016, while the sum is 26.

The square root of 28673 is about 169.3310367298. The cubic root of 28673 is about 30.6072547482.

Subtracting 28673 from its reverse (37682), we obtain a palindrome (9009).

The spelling of 28673 in words is "twenty-eight thousand, six hundred seventy-three".