28018205 has 16 divisors (see below), whose sum is σ = 34992000. Its totient is φ = 21510720.

The previous prime is 28018187. The next prime is 28018247. The reversal of 28018205 is 50281082.

It is not a de Polignac number, because 28018205 - 2¹⁴ = 28001821 is a prime.

It is a super-2 number, since 2×28018205² = 1570039622844050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28370 + ... + 29340.

It is an arithmetic number, because the mean of its divisors is an integer number (2187000).

Almost surely, 2^28018205 is an apocalyptic number.

It is an amenable number.

28018205 is a deficient number, since it is larger than the sum of its proper divisors (6973795).

28018205 is a wasteful number, since it uses less digits than its factorization.

28018205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 28018205 is about 5293.2225534168. Note that the first 3 decimals coincide. The cubic root of 28018205 is about 303.7246937658.

Adding to 28018205 its reverse (50281082), we get a palindrome (78299287).

The spelling of 28018205 in words is "twenty-eight million, eighteen thousand, two hundred five".