28168516 has 6 divisors (see below), whose sum is σ = 49294910. Its totient is φ = 14084256.

The previous prime is 28168513. The next prime is 28168523. The reversal of 28168516 is 61586182.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 36100 = 5304^2 + 190^2 .

It is not an unprimeable number, because it can be changed into a prime (28168513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3521061 + ... + 3521068.

Almost surely, 2^28168516 is an apocalyptic number.

It is an amenable number.

28168516 is a deficient number, since it is larger than the sum of its proper divisors (21126394).

28168516 is a wasteful number, since it uses less digits than its factorization.

28168516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7042133 (or 7042131 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 28168516 is about 5307.4020009794. The cubic root of 28168516 is about 304.2668622767.

The spelling of 28168516 in words is "twenty-eight million, one hundred sixty-eight thousand, five hundred sixteen".