28169025 has 24 divisors (see below), whose sum is σ = 47836224. Its totient is φ = 14616000.

The previous prime is 28168991. The next prime is 28169033. The reversal of 28169025 is 52096182.

It is not a de Polignac number, because 28169025 - 2⁸ = 28168769 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2301 + ... + 7850.

It is an arithmetic number, because the mean of its divisors is an integer number (1993176).

Almost surely, 2^28169025 is an apocalyptic number.

28169025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28169025 is a deficient number, since it is larger than the sum of its proper divisors (19667199).

28169025 is a wasteful number, since it uses less digits than its factorization.

28169025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10201 (or 10196 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 28169025 is about 5307.4499526609. The cubic root of 28169025 is about 304.2686949481.

The spelling of 28169025 in words is "twenty-eight million, one hundred sixty-nine thousand, twenty-five".