28168963 has 4 divisors (see below), whose sum is σ = 29651560. Its totient is φ = 26686368.

The previous prime is 28168939. The next prime is 28168967. The reversal of 28168963 is 36986182.

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 28168963 - 2⁹ = 28168451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28168967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741270 + ... + 741307.

It is an arithmetic number, because the mean of its divisors is an integer number (7412890).

Almost surely, 2^28168963 is an apocalyptic number.

28168963 is a deficient number, since it is larger than the sum of its proper divisors (1482597).

28168963 is a wasteful number, since it uses less digits than its factorization.

28168963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482596.

The product of its digits is 124416, while the sum is 43.

The square root of 28168963 is about 5307.4441118113. Note that the first 3 decimals coincide. The cubic root of 28168963 is about 304.2684717162.

The spelling of 28168963 in words is "twenty-eight million, one hundred sixty-eight thousand, nine hundred sixty-three".