28339643 has 2 divisors, whose sum is σ = 28339644. Its totient is φ = 28339642.

The previous prime is 28339639. The next prime is 28339667. The reversal of 28339643 is 34693382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28339643 - 2² = 28339639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28339597 and 28339606.

It is not a weakly prime, because it can be changed into another prime (28339613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14169821 + 14169822.

It is an arithmetic number, because the mean of its divisors is an integer number (14169822).

Almost surely, 2^28339643 is an apocalyptic number.

28339643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28339643 is an equidigital number, since it uses as much as digits as its factorization.

28339643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 38.

The square root of 28339643 is about 5323.4991312106. The cubic root of 28339643 is about 304.8817708920.

It can be divided in two parts, 28339 and 643, that added together give a palindrome (28982).

The spelling of 28339643 in words is "twenty-eight million, three hundred thirty-nine thousand, six hundred forty-three".