28836509 has 8 divisors (see below), whose sum is σ = 32689440. Its totient is φ = 25217136.

The previous prime is 28836499. The next prime is 28836517. The reversal of 28836509 is 90563882.

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 28836509 - 2⁸ = 28836253 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 (28836529) 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, 58127 + ... + 58620.

It is an arithmetic number, because the mean of its divisors is an integer number (4086180).

Almost surely, 2^28836509 is an apocalyptic number.

It is an amenable number.

28836509 is a deficient number, since it is larger than the sum of its proper divisors (3852931).

28836509 is a wasteful number, since it uses less digits than its factorization.

28836509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116779.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 28836509 is about 5369.9635939176. The cubic root of 28836509 is about 306.6532422973.

The spelling of 28836509 in words is "twenty-eight million, eight hundred thirty-six thousand, five hundred nine".