28205418 has 16 divisors (see below), whose sum is σ = 56568960. Its totient is φ = 9375456.

The previous prime is 28205407. The next prime is 28205447. The reversal of 28205418 is 81450282.

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 7 ways as a sum of consecutive naturals, for example, 4203 + ... + 8606.

It is an arithmetic number, because the mean of its divisors is an integer number (3535560).

Almost surely, 2^28205418 is an apocalyptic number.

28205418 is an abundant number, since it is smaller than the sum of its proper divisors (28363542).

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

28205418 is a wasteful number, since it uses less digits than its factorization.

28205418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13181.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28205418 is about 5310.8773286530. The cubic root of 28205418 is about 304.3996719738.

The spelling of 28205418 in words is "twenty-eight million, two hundred five thousand, four hundred eighteen".