28304469 has 6 divisors (see below), whose sum is σ = 40884246. Its totient is φ = 18869640.

The previous prime is 28304459. The next prime is 28304477. The reversal of 28304469 is 96440382.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 9381969 = 4350^2 + 3063^2 .

It is not a de Polignac number, because 28304469 - 2⁴ = 28304453 is a prime.

It is a super-2 number, since 2×28304469² = 1602285930743922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1572462 + ... + 1572479.

It is an arithmetic number, because the mean of its divisors is an integer number (6814041).

Almost surely, 2^28304469 is an apocalyptic number.

It is an amenable number.

28304469 is a deficient number, since it is larger than the sum of its proper divisors (12579777).

28304469 is a wasteful number, since it uses less digits than its factorization.

28304469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144947 (or 3144944 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 28304469 is about 5320.1944513335. The cubic root of 28304469 is about 304.7555830972.

The spelling of 28304469 in words is "twenty-eight million, three hundred four thousand, four hundred sixty-nine".