28585509 has 8 divisors (see below), whose sum is σ = 38142720. Its totient is φ = 19042656.

The previous prime is 28585507. The next prime is 28585549. The reversal of 28585509 is 90558582.

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

It is not a de Polignac number, because 28585509 - 2¹ = 28585507 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28585507) 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, 2569 + ... + 7985.

It is an arithmetic number, because the mean of its divisors is an integer number (4767840).

Almost surely, 2^28585509 is an apocalyptic number.

It is an amenable number.

28585509 is a deficient number, since it is larger than the sum of its proper divisors (9557211).

28585509 is a wasteful number, since it uses less digits than its factorization.

28585509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7179.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 28585509 is about 5346.5417795057. The cubic root of 28585509 is about 305.7609200931.

The spelling of 28585509 in words is "twenty-eight million, five hundred eighty-five thousand, five hundred nine".