28140163 has 4 divisors (see below), whose sum is σ = 28167048. Its totient is φ = 28113280.

The previous prime is 28140143. The next prime is 28140187. The reversal of 28140163 is 36104182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36104182 = 2 ⋅18052091.

It is a cyclic number.

It is not a de Polignac number, because 28140163 - 2⁵ = 28140131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28140143) 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, 11806 + ... + 13987.

It is an arithmetic number, because the mean of its divisors is an integer number (7041762).

Almost surely, 2^28140163 is an apocalyptic number.

28140163 is a deficient number, since it is larger than the sum of its proper divisors (26885).

28140163 is a wasteful number, since it uses less digits than its factorization.

28140163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26884.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28140163 is about 5304.7302476186. The cubic root of 28140163 is about 304.1647414736.

The spelling of 28140163 in words is "twenty-eight million, one hundred forty thousand, one hundred sixty-three".