28388216 has 16 divisors (see below), whose sum is σ = 55063800. Its totient is φ = 13704544.

The previous prime is 28388209. The next prime is 28388251. The reversal of 28388216 is 61288382.

It is a self number, because there is not a number n which added to its sum of digits gives 28388216.

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 3 ways as a sum of consecutive naturals, for example, 60950 + ... + 61413.

Almost surely, 2^28388216 is an apocalyptic number.

It is an amenable number.

28388216 is a deficient number, since it is larger than the sum of its proper divisors (26675584).

28388216 is a wasteful number, since it uses less digits than its factorization.

28388216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122398 (or 122394 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 28388216 is about 5328.0593089792. The cubic root of 28388216 is about 305.0558564725.

The spelling of 28388216 in words is "twenty-eight million, three hundred eighty-eight thousand, two hundred sixteen".