28523205 has 16 divisors (see below), whose sum is σ = 50708160. Its totient is φ = 15212304.

The previous prime is 28523179. The next prime is 28523213. The reversal of 28523205 is 50232582.

It is not a de Polignac number, because 28523205 - 2¹⁰ = 28522181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 105507 + ... + 105776.

It is an arithmetic number, because the mean of its divisors is an integer number (3169260).

Almost surely, 2^28523205 is an apocalyptic number.

It is an amenable number.

28523205 is a deficient number, since it is larger than the sum of its proper divisors (22184955).

28523205 is a wasteful number, since it uses less digits than its factorization.

28523205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211297 (or 211291 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 28523205 is about 5340.7120311809. The cubic root of 28523205 is about 305.5386164837.

Adding to 28523205 its reverse (50232582), we get a palindrome (78755787).

The spelling of 28523205 in words is "twenty-eight million, five hundred twenty-three thousand, two hundred five".