28324505 has 16 divisors (see below), whose sum is σ = 37433664. Its totient is φ = 20402880.

The previous prime is 28324411. The next prime is 28324507. The reversal of 28324505 is 50542382.

It is not a de Polignac number, because 28324505 - 2¹⁶ = 28258969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28324507) 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, 3479 + ... + 8291.

It is an arithmetic number, because the mean of its divisors is an integer number (2339604).

Almost surely, 2^28324505 is an apocalyptic number.

It is an amenable number.

28324505 is a deficient number, since it is larger than the sum of its proper divisors (9109159).

28324505 is a wasteful number, since it uses less digits than its factorization.

28324505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 28324505 is about 5322.0771320980. The cubic root of 28324505 is about 304.8274756624.

Adding to 28324505 its reverse (50542382), we get a palindrome (78866887).

It can be divided in two parts, 2832 and 4505, that added together give a palindrome (7337).

The spelling of 28324505 in words is "twenty-eight million, three hundred twenty-four thousand, five hundred five".