28168143 has 4 divisors (see below), whose sum is σ = 37557528. Its totient is φ = 18778760.

The previous prime is 28168103. The next prime is 28168163. The reversal of 28168143 is 34186182.

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

It is a cyclic number.

It is not a de Polignac number, because 28168143 - 2⁶ = 28168079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4694688 + ... + 4694693.

It is an arithmetic number, because the mean of its divisors is an integer number (9389382).

Almost surely, 2^28168143 is an apocalyptic number.

28168143 is a deficient number, since it is larger than the sum of its proper divisors (9389385).

28168143 is an equidigital number, since it uses as much as digits as its factorization.

28168143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9389384.

The product of its digits is 9216, while the sum is 33.

The square root of 28168143 is about 5307.3668612599. The cubic root of 28168143 is about 304.2655192638.

The spelling of 28168143 in words is "twenty-eight million, one hundred sixty-eight thousand, one hundred forty-three".