28230909 has 12 divisors (see below), whose sum is σ = 43786944. Its totient is φ = 16131864.

The previous prime is 28230877. The next prime is 28230947. The reversal of 28230909 is 90903282.

It is not a de Polignac number, because 28230909 - 2⁵ = 28230877 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28230909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28230989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95877 + ... + 96170.

It is an arithmetic number, because the mean of its divisors is an integer number (3648912).

Almost surely, 2^28230909 is an apocalyptic number.

It is an amenable number.

28230909 is a deficient number, since it is larger than the sum of its proper divisors (15556035).

28230909 is a wasteful number, since it uses less digits than its factorization.

28230909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192064 (or 192057 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 28230909 is about 5313.2766726381. The cubic root of 28230909 is about 304.4913460349.

The spelling of 28230909 in words is "twenty-eight million, two hundred thirty thousand, nine hundred nine".