28836309 has 8 divisors (see below), whose sum is σ = 39100320. Its totient is φ = 18898256.

The previous prime is 28836307. The next prime is 28836317. The reversal of 28836309 is 90363882.

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 28836309 - 2¹ = 28836307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28836307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81282 + ... + 81635.

It is an arithmetic number, because the mean of its divisors is an integer number (4887540).

Almost surely, 2^28836309 is an apocalyptic number.

It is an amenable number.

28836309 is a deficient number, since it is larger than the sum of its proper divisors (10264011).

28836309 is a wasteful number, since it uses less digits than its factorization.

28836309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162979.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28836309 is about 5369.9449717851. The cubic root of 28836309 is about 306.6525333489.

The spelling of 28836309 in words is "twenty-eight million, eight hundred thirty-six thousand, three hundred nine".