28945 has 8 divisors (see below), whose sum is σ = 39744. Its totient is φ = 19824.

The previous prime is 28933. The next prime is 28949. The reversal of 28945 is 54982.

It is a happy number.

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

It is not a de Polignac number, because 28945 - 2⁷ = 28817 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (28949) 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, 379 + ... + 448.

It is an arithmetic number, because the mean of its divisors is an integer number (4968).

2²⁸⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

28945 is a deficient number, since it is larger than the sum of its proper divisors (10799).

28945 is an equidigital number, since it uses as much as digits as its factorization.

28945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its digits is 2880, while the sum is 28.

The square root of 28945 is about 170.1323014598. The cubic root of 28945 is about 30.7037332726.

The spelling of 28945 in words is "twenty-eight thousand, nine hundred forty-five".