28645205 has 4 divisors (see below), whose sum is σ = 34374252. Its totient is φ = 22916160.

The previous prime is 28645159. The next prime is 28645213. The reversal of 28645205 is 50254682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50254682 = 2 ⋅25127341.

It can be written as a sum of positive squares in 2 ways, for example, as 8655364 + 19989841 = 2942^2 + 4471^2 .

It is not a de Polignac number, because 28645205 - 2¹⁰ = 28644181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2864516 + ... + 2864525.

It is an arithmetic number, because the mean of its divisors is an integer number (8593563).

Almost surely, 2^28645205 is an apocalyptic number.

It is an amenable number.

28645205 is a deficient number, since it is larger than the sum of its proper divisors (5729047).

28645205 is an equidigital number, since it uses as much as digits as its factorization.

28645205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729046.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 28645205 is about 5352.1215419682. The cubic root of 28645205 is about 305.9736154220.

Adding to 28645205 its reverse (50254682), we get a palindrome (78899887).

The spelling of 28645205 in words is "twenty-eight million, six hundred forty-five thousand, two hundred five".