28298205 has 54 divisors (see below), whose sum is σ = 53998542. Its totient is φ = 13703040.

The previous prime is 28298203. The next prime is 28298209. The reversal of 28298205 is 50289282.

It can be written as a sum of positive squares in 9 ways, for example, as 27941796 + 356409 = 5286^2 + 597^2 .

It is not a de Polignac number, because 28298205 - 2¹ = 28298203 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28298205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28298203) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 463875 + ... + 463935.

It is an arithmetic number, because the mean of its divisors is an integer number (999973).

Almost surely, 2^28298205 is an apocalyptic number.

It is an amenable number.

28298205 is a deficient number, since it is larger than the sum of its proper divisors (25700337).

28298205 is a wasteful number, since it uses less digits than its factorization.

28298205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28298205 is about 5319.6057184720. The cubic root of 28298205 is about 304.7330998418.

The spelling of 28298205 in words is "twenty-eight million, two hundred ninety-eight thousand, two hundred five".