28605 has 8 divisors (see below), whose sum is σ = 45792. Its totient is φ = 15248.

The previous prime is 28603. The next prime is 28607. The reversal of 28605 is 50682.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28603) and next prime (28607).

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

It is a cyclic number.

It is not a de Polignac number, because 28605 - 2¹ = 28603 is a prime.

28605 is a lucky number.

It is a plaindrome in base 12.

It is a nialpdrome in base 15.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 939 + ... + 968.

It is an arithmetic number, because the mean of its divisors is an integer number (5724).

2²⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

28605 is a deficient number, since it is larger than the sum of its proper divisors (17187).

28605 is a wasteful number, since it uses less digits than its factorization.

28605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28605 is about 169.1301274167. The cubic root of 28605 is about 30.5830398561.

The spelling of 28605 in words is "twenty-eight thousand, six hundred five".