28339813 has 2 divisors, whose sum is σ = 28339814. Its totient is φ = 28339812.

The previous prime is 28339781. The next prime is 28339853. The reversal of 28339813 is 31893382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 16129 = 5322^2 + 127^2 .

It is a cyclic number.

It is not a de Polignac number, because 28339813 - 2⁵ = 28339781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28339853) 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, 14169906 + 14169907.

It is an arithmetic number, because the mean of its divisors is an integer number (14169907).

Almost surely, 2^28339813 is an apocalyptic number.

It is an amenable number.

28339813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28339813 is an equidigital number, since it uses as much as digits as its factorization.

28339813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 28339813 is about 5323.5150981283. The cubic root of 28339813 is about 304.8823805185.

The spelling of 28339813 in words is "twenty-eight million, three hundred thirty-nine thousand, eight hundred thirteen".