28884109 has 4 divisors (see below), whose sum is σ = 28903104. Its totient is φ = 28865116.

The previous prime is 28884073. The next prime is 28884133. The reversal of 28884109 is 90148882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28884109 - 2⁹ = 28883597 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6997 + ... + 10330.

It is an arithmetic number, because the mean of its divisors is an integer number (7225776).

Almost surely, 2^28884109 is an apocalyptic number.

It is an amenable number.

28884109 is a deficient number, since it is larger than the sum of its proper divisors (18995).

28884109 is a wasteful number, since it uses less digits than its factorization.

28884109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18994.

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

The square root of 28884109 is about 5374.3938262840. The cubic root of 28884109 is about 306.8218788704.

The spelling of 28884109 in words is "twenty-eight million, eight hundred eighty-four thousand, one hundred nine".