28191379 has 2 divisors, whose sum is σ = 28191380. Its totient is φ = 28191378.

The previous prime is 28191377. The next prime is 28191403. The reversal of 28191379 is 97319182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28191379 - 2¹ = 28191377 is a prime.

Together with 28191377, 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 (28191377) 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, 14095689 + 14095690.

It is an arithmetic number, because the mean of its divisors is an integer number (14095690).

Almost surely, 2^28191379 is an apocalyptic number.

28191379 is a deficient number, since it is larger than the sum of its proper divisors (1).

28191379 is an equidigital number, since it uses as much as digits as its factorization.

28191379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 28191379 is about 5309.5554427843. Note that the first 3 decimals coincide. The cubic root of 28191379 is about 304.3491595011.

The spelling of 28191379 in words is "twenty-eight million, one hundred ninety-one thousand, three hundred seventy-nine".