28009669 has 2 divisors, whose sum is σ = 28009670. Its totient is φ = 28009668.

The previous prime is 28009661. The next prime is 28009721. The reversal of 28009669 is 96690082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27720225 + 289444 = 5265^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 28009669 - 2³ = 28009661 is a prime.

It is a super-2 number, since 2×28009669² = 1569083114979122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28009661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14004834 + 14004835.

It is an arithmetic number, because the mean of its divisors is an integer number (14004835).

Almost surely, 2^28009669 is an apocalyptic number.

It is an amenable number.

28009669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28009669 is an equidigital number, since it uses as much as digits as its factorization.

28009669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 28009669 is about 5292.4161778908. The cubic root of 28009669 is about 303.6938464730.

The spelling of 28009669 in words is "twenty-eight million, nine thousand, six hundred sixty-nine".