28133839 has 2 divisors, whose sum is σ = 28133840. Its totient is φ = 28133838.

The previous prime is 28133797. The next prime is 28133849. The reversal of 28133839 is 93833182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28133839 - 2⁹ = 28133327 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28133798 and 28133807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28133849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066919 + 14066920.

It is an arithmetic number, because the mean of its divisors is an integer number (14066920).

Almost surely, 2^28133839 is an apocalyptic number.

28133839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133839 is an equidigital number, since it uses as much as digits as its factorization.

28133839 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 28133839 is about 5304.1341423459. The cubic root of 28133839 is about 304.1419545654.

The spelling of 28133839 in words is "twenty-eight million, one hundred thirty-three thousand, eight hundred thirty-nine".