28198369 has 2 divisors, whose sum is σ = 28198370. Its totient is φ = 28198368.

The previous prime is 28198361. The next prime is 28198381. The reversal of 28198369 is 96389182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22848400 + 5349969 = 4780^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 28198369 - 2³ = 28198361 is a prime.

It is a super-2 number, since 2×28198369² = 1590296028520322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28198361) 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, 14099184 + 14099185.

It is an arithmetic number, because the mean of its divisors is an integer number (14099185).

Almost surely, 2^28198369 is an apocalyptic number.

It is an amenable number.

28198369 is a deficient number, since it is larger than the sum of its proper divisors (1).

28198369 is an equidigital number, since it uses as much as digits as its factorization.

28198369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 28198369 is about 5310.2136491859. The cubic root of 28198369 is about 304.3743116918.

The spelling of 28198369 in words is "twenty-eight million, one hundred ninety-eight thousand, three hundred sixty-nine".