28168925 has 24 divisors (see below), whose sum is σ = 37973760. Its totient is φ = 20649600.

The previous prime is 28168919. The next prime is 28168939. The reversal of 28168925 is 52986182.

It is not a de Polignac number, because 28168925 - 2⁴ = 28168909 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13769 + ... + 15681.

It is an arithmetic number, because the mean of its divisors is an integer number (1582240).

Almost surely, 2^28168925 is an apocalyptic number.

28168925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28168925 is a deficient number, since it is larger than the sum of its proper divisors (9804835).

28168925 is a wasteful number, since it uses less digits than its factorization.

28168925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973 (or 1968 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 28168925 is about 5307.4405319325. The cubic root of 28168925 is about 304.2683348965.

The spelling of 28168925 in words is "twenty-eight million, one hundred sixty-eight thousand, nine hundred twenty-five".