28168197 has 4 divisors (see below), whose sum is σ = 37557600. Its totient is φ = 18778796.

The previous prime is 28168187. The next prime is 28168199. The reversal of 28168197 is 79186182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28168197 - 2¹⁶ = 28102661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168199) 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 in 3 ways as a sum of consecutive naturals, for example, 4694697 + ... + 4694702.

It is an arithmetic number, because the mean of its divisors is an integer number (9389400).

Almost surely, 2^28168197 is an apocalyptic number.

It is an amenable number.

28168197 is a deficient number, since it is larger than the sum of its proper divisors (9389403).

28168197 is an equidigital number, since it uses as much as digits as its factorization.

28168197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9389402.

The product of its digits is 48384, while the sum is 42.

The square root of 28168197 is about 5307.3719485259. The cubic root of 28168197 is about 304.2657136953.

The spelling of 28168197 in words is "twenty-eight million, one hundred sixty-eight thousand, one hundred ninety-seven".