28868109 has 8 divisors (see below), whose sum is σ = 38630880. Its totient is φ = 19175376.

The previous prime is 28868107. The next prime is 28868117. The reversal of 28868109 is 90186882.

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

It is not a de Polignac number, because 28868109 - 2¹ = 28868107 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28868107) 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, 16539 + ... + 18200.

It is an arithmetic number, because the mean of its divisors is an integer number (4828860).

Almost surely, 2^28868109 is an apocalyptic number.

It is an amenable number.

28868109 is a deficient number, since it is larger than the sum of its proper divisors (9762771).

28868109 is a wasteful number, since it uses less digits than its factorization.

28868109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35019.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28868109 is about 5372.9050801219. The cubic root of 28868109 is about 306.7652149934.

The spelling of 28868109 in words is "twenty-eight million, eight hundred sixty-eight thousand, one hundred nine".