28168173 has 12 divisors (see below), whose sum is σ = 44386368. Its totient is φ = 17071560.

The previous prime is 28168163. The next prime is 28168177. The reversal of 28168173 is 37186182.

It is not a de Polignac number, because 28168173 - 2⁸ = 28167917 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142165 + ... + 142362.

It is an arithmetic number, because the mean of its divisors is an integer number (3698864).

Almost surely, 2^28168173 is an apocalyptic number.

It is an amenable number.

28168173 is a deficient number, since it is larger than the sum of its proper divisors (16218195).

28168173 is a wasteful number, since it uses less digits than its factorization.

28168173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284544 (or 284541 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 28168173 is about 5307.3696875194. The cubic root of 28168173 is about 304.2656272813.

Subtracting 28168173 from its reverse (37186182), we obtain a square (9018009 = 3003²).

The spelling of 28168173 in words is "twenty-eight million, one hundred sixty-eight thousand, one hundred seventy-three".