28381112 has 8 divisors (see below), whose sum is σ = 53214600. Its totient is φ = 14190552.

The previous prime is 28381099. The next prime is 28381127. The reversal of 28381112 is 21118382.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1773812 + ... + 1773827.

It is an arithmetic number, because the mean of its divisors is an integer number (6651825).

Almost surely, 2^28381112 is an apocalyptic number.

It is an amenable number.

28381112 is a deficient number, since it is larger than the sum of its proper divisors (24833488).

28381112 is a wasteful number, since it uses less digits than its factorization.

28381112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547645 (or 3547641 counting only the distinct ones).

The product of its digits is 768, while the sum is 26.

The square root of 28381112 is about 5327.3926080213. The cubic root of 28381112 is about 305.0304081480.

Adding to 28381112 its reverse (21118382), we get a palindrome (49499494).

The spelling of 28381112 in words is "twenty-eight million, three hundred eighty-one thousand, one hundred twelve".