28169918 has 16 divisors (see below), whose sum is σ = 51132384. Its totient is φ = 11362560.

The previous prime is 28169903. The next prime is 28169971. The reversal of 28169918 is 81996182.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58943 + ... + 59418.

It is an arithmetic number, because the mean of its divisors is an integer number (3195774).

Almost surely, 2^28169918 is an apocalyptic number.

28169918 is a deficient number, since it is larger than the sum of its proper divisors (22962466).

28169918 is a wasteful number, since it uses less digits than its factorization.

28169918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118387.

The product of its digits is 62208, while the sum is 44.

The square root of 28169918 is about 5307.5340790239. The cubic root of 28169918 is about 304.2719101708.

The spelling of 28169918 in words is "twenty-eight million, one hundred sixty-nine thousand, nine hundred eighteen".