28100205 has 48 divisors (see below), whose sum is σ = 57193344. Its totient is φ = 12493440.

The previous prime is 28100161. The next prime is 28100209. The reversal of 28100205 is 50200182.

It is not a de Polignac number, because 28100205 - 2⁶ = 28100141 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10450 + ... + 12860.

It is an arithmetic number, because the mean of its divisors is an integer number (1191528).

Almost surely, 2^28100205 is an apocalyptic number.

It is an amenable number.

28100205 is an abundant number, since it is smaller than the sum of its proper divisors (29093139).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28100205 is a wasteful number, since it uses less digits than its factorization.

28100205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466 (or 2463 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 28100205 is about 5300.9626484253. The cubic root of 28100205 is about 304.0207056823.

Adding to 28100205 its reverse (50200182), we get a palindrome (78300387).

The spelling of 28100205 in words is "twenty-eight million, one hundred thousand, two hundred five".