28708 has 6 divisors (see below), whose sum is σ = 50246. Its totient is φ = 14352.

The previous prime is 28703. The next prime is 28711. The reversal of 28708 is 80782.

It can be written as a sum of positive squares in only one way, i.e., 28224 + 484 = 168^2 + 22^2 .

It is not an unprimeable number, because it can be changed into a prime (28703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3585 + ... + 3592.

2²⁸⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

28708 is a deficient number, since it is larger than the sum of its proper divisors (21538).

28708 is a wasteful number, since it uses less digits than its factorization.

28708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7181 (or 7179 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 28708 is about 169.4343530693. The cubic root of 28708 is about 30.6197033739.

The spelling of 28708 in words is "twenty-eight thousand, seven hundred eight".