28304169 has 4 divisors (see below), whose sum is σ = 37738896. Its totient is φ = 18869444.

The previous prime is 28304161. The next prime is 28304197. The reversal of 28304169 is 96140382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28304169 - 2³ = 28304161 is a prime.

It is a super-2 number, since 2×28304169² = 1602251965561122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28304161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4717359 + ... + 4717364.

It is an arithmetic number, because the mean of its divisors is an integer number (9434724).

Almost surely, 2^28304169 is an apocalyptic number.

It is an amenable number.

28304169 is a deficient number, since it is larger than the sum of its proper divisors (9434727).

28304169 is an equidigital number, since it uses as much as digits as its factorization.

28304169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434726.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28304169 is about 5320.1662568006. The cubic root of 28304169 is about 304.7545063886.

The spelling of 28304169 in words is "twenty-eight million, three hundred four thousand, one hundred sixty-nine".