28103812 has 24 divisors (see below), whose sum is σ = 56478240. Its totient is φ = 12101760.

The previous prime is 28103809. The next prime is 28103827. The reversal of 28103812 is 21830182.

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 7 ways as a sum of consecutive naturals, for example, 15973 + ... + 17644.

It is an arithmetic number, because the mean of its divisors is an integer number (2353260).

Almost surely, 2^28103812 is an apocalyptic number.

28103812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28103812 is an abundant number, since it is smaller than the sum of its proper divisors (28374428).

28103812 is a wasteful number, since it uses less digits than its factorization.

28103812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33651 (or 33649 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28103812 is about 5301.3028587320. The cubic root of 28103812 is about 304.0337133663.

Adding to 28103812 its reverse (21830182), we get a palindrome (49933994).

The spelling of 28103812 in words is "twenty-eight million, one hundred three thousand, eight hundred twelve".