28318609 has 8 divisors (see below), whose sum is σ = 31116960. Its totient is φ = 25557600.

The previous prime is 28318603. The next prime is 28318627. The reversal of 28318609 is 90681382.

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 28318609 - 2¹³ = 28310417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28318603) 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, 7732 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (3889620).

Almost surely, 2^28318609 is an apocalyptic number.

It is an amenable number.

28318609 is a deficient number, since it is larger than the sum of its proper divisors (2798351).

28318609 is a wasteful number, since it uses less digits than its factorization.

28318609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18671.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28318609 is about 5321.5231842021. The cubic root of 28318609 is about 304.8063233361.

The spelling of 28318609 in words is "twenty-eight million, three hundred eighteen thousand, six hundred nine".