28504307 has 8 divisors (see below), whose sum is σ = 31446240. Its totient is φ = 25669440.

The previous prime is 28504277. The next prime is 28504309. The reversal of 28504307 is 70340582.

It is a happy number.

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 28504307 - 2⁶ = 28504243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28504307.

It is not an unprimeable number, because it can be changed into a prime (28504309) 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, 26207 + ... + 27272.

It is an arithmetic number, because the mean of its divisors is an integer number (3930780).

Almost surely, 2^28504307 is an apocalyptic number.

28504307 is a deficient number, since it is larger than the sum of its proper divisors (2941933).

28504307 is a wasteful number, since it uses less digits than its factorization.

28504307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53533.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28504307 is about 5338.9424982856. The cubic root of 28504307 is about 305.4711235489.

Adding to 28504307 its reverse (70340582), we get a palindrome (98844889).

The spelling of 28504307 in words is "twenty-eight million, five hundred four thousand, three hundred seven".