28168147 has 4 divisors (see below), whose sum is σ = 32192176. Its totient is φ = 24144120.

The previous prime is 28168103. The next prime is 28168163. The reversal of 28168147 is 74186182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28168147 - 2¹⁵ = 28135379 is a prime.

It is a Duffinian 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, 2012004 + ... + 2012017.

It is an arithmetic number, because the mean of its divisors is an integer number (8048044).

Almost surely, 2^28168147 is an apocalyptic number.

28168147 is a deficient number, since it is larger than the sum of its proper divisors (4024029).

28168147 is an equidigital number, since it uses as much as digits as its factorization.

28168147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024028.

The product of its digits is 21504, while the sum is 37.

The square root of 28168147 is about 5307.3672380946. The cubic root of 28168147 is about 304.2655336661.

The spelling of 28168147 in words is "twenty-eight million, one hundred sixty-eight thousand, one hundred forty-seven".