28168439 has 16 divisors (see below), whose sum is σ = 32332608. Its totient is φ = 24310272.

The previous prime is 28168421. The next prime is 28168451. The reversal of 28168439 is 93486182.

It is not a de Polignac number, because 28168439 - 2⁸ = 28168183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28168396 and 28168405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43214 + ... + 43860.

It is an arithmetic number, because the mean of its divisors is an integer number (2020788).

Almost surely, 2^28168439 is an apocalyptic number.

28168439 is a deficient number, since it is larger than the sum of its proper divisors (4164169).

28168439 is a wasteful number, since it uses less digits than its factorization.

28168439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874.

The product of its digits is 82944, while the sum is 41.

The square root of 28168439 is about 5307.3947469545. The cubic root of 28168439 is about 304.2665850337.

The spelling of 28168439 in words is "twenty-eight million, one hundred sixty-eight thousand, four hundred thirty-nine".