28281116 has 12 divisors (see below), whose sum is σ = 49789488. Its totient is φ = 14055552.

The previous prime is 28281091. The next prime is 28281151. The reversal of 28281116 is 61118282.

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, 20501 + ... + 21836.

It is an arithmetic number, because the mean of its divisors is an integer number (4149124).

Almost surely, 2^28281116 is an apocalyptic number.

It is an amenable number.

28281116 is a deficient number, since it is larger than the sum of its proper divisors (21508372).

28281116 is a wasteful number, since it uses less digits than its factorization.

28281116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42508 (or 42506 counting only the distinct ones).

The product of its digits is 1536, while the sum is 29.

The square root of 28281116 is about 5317.9992478375. Note that the first 3 decimals coincide. The cubic root of 28281116 is about 304.6717457434.

Adding to 28281116 its reverse (61118282), we get a palindrome (89399398).

The spelling of 28281116 in words is "twenty-eight million, two hundred eighty-one thousand, one hundred sixteen".