28187912 has 16 divisors (see below), whose sum is σ = 53106000. Its totient is φ = 14026320.

The previous prime is 28187893. The next prime is 28187933. The reversal of 28187912 is 21978182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6662 + ... + 10037.

It is an arithmetic number, because the mean of its divisors is an integer number (3319125).

Almost surely, 2^28187912 is an apocalyptic number.

It is an amenable number.

28187912 is a deficient number, since it is larger than the sum of its proper divisors (24918088).

28187912 is a wasteful number, since it uses less digits than its factorization.

28187912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16916 (or 16912 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 28187912 is about 5309.2289459017. The cubic root of 28187912 is about 304.3366826160.

The spelling of 28187912 in words is "twenty-eight million, one hundred eighty-seven thousand, nine hundred twelve".