28003884 has 12 divisors (see below), whose sum is σ = 65342424. Its totient is φ = 9334624.

The previous prime is 28003883. The next prime is 28003897. The reversal of 28003884 is 48830082.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×28003884³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28003883) by changing a digit.

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, 1166817 + ... + 1166840.

It is an arithmetic number, because the mean of its divisors is an integer number (5445202).

Almost surely, 2^28003884 is an apocalyptic number.

It is an amenable number.

28003884 is an abundant number, since it is smaller than the sum of its proper divisors (37338540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28003884 is a wasteful number, since it uses less digits than its factorization.

28003884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333664 (or 2333662 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 28003884 is about 5291.8696129062. The cubic root of 28003884 is about 303.6729371474.

The spelling of 28003884 in words is "twenty-eight million, three thousand, eight hundred eighty-four".