28338839 has 2 divisors, whose sum is σ = 28338840. Its totient is φ = 28338838.

The previous prime is 28338833. The next prime is 28338853. The reversal of 28338839 is 93883382.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28338839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28338839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28338833) 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, 14169419 + 14169420.

It is an arithmetic number, because the mean of its divisors is an integer number (14169420).

Almost surely, 2^28338839 is an apocalyptic number.

28338839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28338839 is an equidigital number, since it uses as much as digits as its factorization.

28338839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 28338839 is about 5323.4236164333. The cubic root of 28338839 is about 304.8788876839.

Adding to 28338839 its reverse (93883382), we get a palindrome (122222221).

The spelling of 28338839 in words is "twenty-eight million, three hundred thirty-eight thousand, eight hundred thirty-nine".