28706 has 8 divisors (see below), whose sum is σ = 44544. Its totient is φ = 13860.

The previous prime is 28703. The next prime is 28711. The reversal of 28706 is 60782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 170 + ... + 293.

It is an arithmetic number, because the mean of its divisors is an integer number (5568).

2²⁸⁷⁰⁶ is an apocalyptic number.

28706 is a deficient number, since it is larger than the sum of its proper divisors (15838).

28706 is a wasteful number, since it uses less digits than its factorization.

28706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 28706 is about 169.4284509756. The cubic root of 28706 is about 30.6189922965.

The spelling of 28706 in words is "twenty-eight thousand, seven hundred six".