28168117 has 4 divisors (see below), whose sum is σ = 28187116. Its totient is φ = 28149120.

The previous prime is 28168103. The next prime is 28168163. The reversal of 28168117 is 71186182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71186182 = 2 ⋅35593091.

It can be written as a sum of positive squares in 2 ways, for example, as 10536516 + 17631601 = 3246^2 + 4199^2 .

It is a cyclic number.

It is not a de Polignac number, because 28168117 - 2¹⁹ = 27643829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7068 + ... + 10309.

It is an arithmetic number, because the mean of its divisors is an integer number (7046779).

Almost surely, 2^28168117 is an apocalyptic number.

It is an amenable number.

28168117 is a deficient number, since it is larger than the sum of its proper divisors (18999).

28168117 is a wasteful number, since it uses less digits than its factorization.

28168117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18998.

The product of its digits is 5376, while the sum is 34.

The square root of 28168117 is about 5307.3644118338. The cubic root of 28168117 is about 304.2654256485.

The spelling of 28168117 in words is "twenty-eight million, one hundred sixty-eight thousand, one hundred seventeen".