28360309 has 8 divisors (see below), whose sum is σ = 28693280. Its totient is φ = 28029456.

The previous prime is 28360291. The next prime is 28360313. The reversal of 28360309 is 90306382.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28360309 - 2¹⁷ = 28229237 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 (28360379) 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, 51574 + ... + 52120.

It is an arithmetic number, because the mean of its divisors is an integer number (3586660).

Almost surely, 2^28360309 is an apocalyptic number.

It is an amenable number.

28360309 is a deficient number, since it is larger than the sum of its proper divisors (332971).

28360309 is a wasteful number, since it uses less digits than its factorization.

28360309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 28360309 is about 5325.4397940452. The cubic root of 28360309 is about 304.9558621071.

The spelling of 28360309 in words is "twenty-eight million, three hundred sixty thousand, three hundred nine".