28333889 has 2 divisors, whose sum is σ = 28333890. Its totient is φ = 28333888.

The previous prime is 28333873. The next prime is 28333891. The reversal of 28333889 is 98833382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16875664 + 11458225 = 4108^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 28333889 - 2⁴ = 28333873 is a prime.

Together with 28333891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28333289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14166944 + 14166945.

It is an arithmetic number, because the mean of its divisors is an integer number (14166945).

Almost surely, 2^28333889 is an apocalyptic number.

It is an amenable number.

28333889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28333889 is an equidigital number, since it uses as much as digits as its factorization.

28333889 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 28333889 is about 5322.9586697625. The cubic root of 28333889 is about 304.8611353879.

The spelling of 28333889 in words is "twenty-eight million, three hundred thirty-three thousand, eight hundred eighty-nine".