28168738 has 16 divisors (see below), whose sum is σ = 45634680. Its totient is φ = 12963456.

The previous prime is 28168709. The next prime is 28168747. The reversal of 28168738 is 83786182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27008809 + 1159929 = 5197^2 + 1077^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28168694 and 28168703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8958 + ... + 11686.

Almost surely, 2^28168738 is an apocalyptic number.

28168738 is a deficient number, since it is larger than the sum of its proper divisors (17465942).

28168738 is a wasteful number, since it uses less digits than its factorization.

28168738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141.

The product of its digits is 129024, while the sum is 43.

The square root of 28168738 is about 5307.4229151256. The cubic root of 28168738 is about 304.2676615978.

The spelling of 28168738 in words is "twenty-eight million, one hundred sixty-eight thousand, seven hundred thirty-eight".