28335389 has 2 divisors, whose sum is σ = 28335390. Its totient is φ = 28335388.

The previous prime is 28335383. The next prime is 28335421. The reversal of 28335389 is 98353382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16467364 + 11868025 = 4058^2 + 3445^2 .

It is a cyclic number.

It is not a de Polignac number, because 28335389 - 2²⁰ = 27286813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28335383) 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, 14167694 + 14167695.

It is an arithmetic number, because the mean of its divisors is an integer number (14167695).

Almost surely, 2^28335389 is an apocalyptic number.

It is an amenable number.

28335389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28335389 is an equidigital number, since it uses as much as digits as its factorization.

28335389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 28335389 is about 5323.0995669816. The cubic root of 28335389 is about 304.8665150899.

The spelling of 28335389 in words is "twenty-eight million, three hundred thirty-five thousand, three hundred eighty-nine".