28395609 has 16 divisors (see below), whose sum is σ = 42265344. Its totient is φ = 16808400.

The previous prime is 28395589. The next prime is 28395623. The reversal of 28395609 is 90659382.

It is not a de Polignac number, because 28395609 - 2¹⁶ = 28330073 is a prime.

It is a super-2 number, since 2×28395609² = 1612621220961762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28395629) 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 15 ways as a sum of consecutive naturals, for example, 8587 + ... + 11424.

It is an arithmetic number, because the mean of its divisors is an integer number (2641584).

Almost surely, 2^28395609 is an apocalyptic number.

It is an amenable number.

28395609 is a deficient number, since it is larger than the sum of its proper divisors (13869735).

28395609 is a wasteful number, since it uses less digits than its factorization.

28395609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20068.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 28395609 is about 5328.7530436304. The cubic root of 28395609 is about 305.0823355604.

It can be divided in two parts, 2839 and 5609, that added together give a palindrome (8448).

The spelling of 28395609 in words is "twenty-eight million, three hundred ninety-five thousand, six hundred nine".