28820109 has 8 divisors (see below), whose sum is σ = 38451712. Its totient is φ = 19200960.

The previous prime is 28820063. The next prime is 28820119. The reversal of 28820109 is 90102882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28820109 - 2¹³ = 28811917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6804 + ... + 10194.

It is an arithmetic number, because the mean of its divisors is an integer number (4806464).

Almost surely, 2^28820109 is an apocalyptic number.

It is an amenable number.

28820109 is a deficient number, since it is larger than the sum of its proper divisors (9631603).

28820109 is a wasteful number, since it uses less digits than its factorization.

28820109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28820109 is about 5368.4363645292. The cubic root of 28820109 is about 306.5950976392.

The spelling of 28820109 in words is "twenty-eight million, eight hundred twenty thousand, one hundred nine".