28306 has 4 divisors (see below), whose sum is σ = 42462. Its totient is φ = 14152.

The previous prime is 28297. The next prime is 28307. The reversal of 28306 is 60382.

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

It can be written as a sum of positive squares in only one way, i.e., 25281 + 3025 = 159^2 + 55^2 .

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (28307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7075 + ... + 7078.

2²⁸³⁰⁶ is an apocalyptic number.

28306 is a deficient number, since it is larger than the sum of its proper divisors (14156).

28306 is a wasteful number, since it uses less digits than its factorization.

28306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14155.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 28306 is about 168.2438706164. The cubic root of 28306 is about 30.4761077782.

Adding to 28306 its reverse (60382), we get a palindrome (88688).

The spelling of 28306 in words is "twenty-eight thousand, three hundred six".