28906 has 8 divisors (see below), whose sum is σ = 44100. Its totient is φ = 14208.

The previous prime is 28901. The next prime is 28909. The reversal of 28906 is 60982.

It can be written as a sum of positive squares in 2 ways, for example, as 27225 + 1681 = 165^2 + 41^2 .

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

It is a plaindrome in base 12.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (28901) 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, 120 + ... + 268.

2²⁸⁹⁰⁶ is an apocalyptic number.

28906 is a deficient number, since it is larger than the sum of its proper divisors (15194).

28906 is a wasteful number, since it uses less digits than its factorization.

28906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28906 is about 170.0176461430. The cubic root of 28906 is about 30.6899371788.

The spelling of 28906 in words is "twenty-eight thousand, nine hundred six".