28389793 has 2 divisors, whose sum is σ = 28389794. Its totient is φ = 28389792.

The previous prime is 28389791. The next prime is 28389853. The reversal of 28389793 is 39798382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28387584 + 2209 = 5328^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 28389793 - 2¹ = 28389791 is a prime.

Together with 28389791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28389791) 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, 14194896 + 14194897.

It is an arithmetic number, because the mean of its divisors is an integer number (14194897).

Almost surely, 2^28389793 is an apocalyptic number.

It is an amenable number.

28389793 is a deficient number, since it is larger than the sum of its proper divisors (1).

28389793 is an equidigital number, since it uses as much as digits as its factorization.

28389793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 28389793 is about 5328.2072970184. The cubic root of 28389793 is about 305.0615051095.

The spelling of 28389793 in words is "twenty-eight million, three hundred eighty-nine thousand, seven hundred ninety-three".