28109884 has 12 divisors (see below), whose sum is σ = 53664408. Its totient is φ = 12777200.

The previous prime is 28109869. The next prime is 28109897. The reversal of 28109884 is 48890182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319387 + ... + 319474.

It is an arithmetic number, because the mean of its divisors is an integer number (4472034).

Almost surely, 2^28109884 is an apocalyptic number.

It is an amenable number.

28109884 is a deficient number, since it is larger than the sum of its proper divisors (25554524).

28109884 is a wasteful number, since it uses less digits than its factorization.

28109884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638876 (or 638874 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 28109884 is about 5301.8755172109. The cubic root of 28109884 is about 304.0556079023.

It can be divided in two parts, 281098 and 84, that added together give a palindrome (281182).

The spelling of 28109884 in words is "twenty-eight million, one hundred nine thousand, eight hundred eighty-four".