28658 has 16 divisors (see below), whose sum is σ = 51840. Its totient is φ = 11616.

The previous prime is 28657. The next prime is 28661. The reversal of 28658 is 85682.

It is a happy number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 28658.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28658.

It is not an unprimeable number, because it can be changed into a prime (28657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (3240).

2²⁸⁶⁵⁸ is an apocalyptic number.

28658 is a deficient number, since it is larger than the sum of its proper divisors (23182).

28658 is a wasteful number, since it uses less digits than its factorization.

28658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121.

The product of its digits is 3840, while the sum is 29.

The square root of 28658 is about 169.2867389963. The cubic root of 28658 is about 30.6019165217.

It can be divided in two parts, 28 and 658, that added together give a palindrome (686).

The spelling of 28658 in words is "twenty-eight thousand, six hundred fifty-eight".