28160909 has 8 divisors (see below), whose sum is σ = 32222208. Its totient is φ = 24109200.

The previous prime is 28160903. The next prime is 28160929. The reversal of 28160909 is 90906182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28160909 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 (28160903) 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, 5759 + ... + 9459.

It is an arithmetic number, because the mean of its divisors is an integer number (4027776).

Almost surely, 2^28160909 is an apocalyptic number.

It is an amenable number.

28160909 is a deficient number, since it is larger than the sum of its proper divisors (4061299).

28160909 is a wasteful number, since it uses less digits than its factorization.

28160909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 28160909 is about 5306.6853119438. The cubic root of 28160909 is about 304.2394703899.

The spelling of 28160909 in words is "twenty-eight million, one hundred sixty thousand, nine hundred nine".