28199393 has 2 divisors, whose sum is σ = 28199394. Its totient is φ = 28199392.

The previous prime is 28199377. The next prime is 28199407. The reversal of 28199393 is 39399182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 9778129 = 4292^2 + 3127^2 .

It is a cyclic number.

It is not a de Polignac number, because 28199393 - 2⁴ = 28199377 is a prime.

It is not a weakly prime, because it can be changed into another prime (28199593) 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, 14099696 + 14099697.

It is an arithmetic number, because the mean of its divisors is an integer number (14099697).

Almost surely, 2^28199393 is an apocalyptic number.

It is an amenable number.

28199393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28199393 is an equidigital number, since it uses as much as digits as its factorization.

28199393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 28199393 is about 5310.3100662767. The cubic root of 28199393 is about 304.3779960127.

The spelling of 28199393 in words is "twenty-eight million, one hundred ninety-nine thousand, three hundred ninety-three".