28168690 has 16 divisors (see below), whose sum is σ = 55313280. Its totient is φ = 10243120.

The previous prime is 28168687. The next prime is 28168709. The reversal of 28168690 is 9686182.

It is a super-2 number, since 2×28168690² = 1586950192632200, which contains 22 as substring.

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, 127930 + ... + 128149.

It is an arithmetic number, because the mean of its divisors is an integer number (3457080).

Almost surely, 2^28168690 is an apocalyptic number.

28168690 is a deficient number, since it is larger than the sum of its proper divisors (27144590).

28168690 is a wasteful number, since it uses less digits than its factorization.

28168690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256097.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28168690 is about 5307.4183931550. The cubic root of 28168690 is about 304.2674887719.

The spelling of 28168690 in words is "twenty-eight million, one hundred sixty-eight thousand, six hundred ninety".