28814309 has 2 divisors, whose sum is σ = 28814310. Its totient is φ = 28814308.

The previous prime is 28814299. The next prime is 28814311. The reversal of 28814309 is 90341882.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 13432225 = 3922^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 28814309 - 2⁴ = 28814293 is a prime.

Together with 28814311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28814809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14407154 + 14407155.

It is an arithmetic number, because the mean of its divisors is an integer number (14407155).

Almost surely, 2^28814309 is an apocalyptic number.

It is an amenable number.

28814309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28814309 is an equidigital number, since it uses as much as digits as its factorization.

28814309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28814309 is about 5367.8961428105. The cubic root of 28814309 is about 306.5745290046.

The spelling of 28814309 in words is "twenty-eight million, eight hundred fourteen thousand, three hundred nine".