28168225 has 12 divisors (see below), whose sum is σ = 35742256. Its totient is φ = 22009680.

The previous prime is 28168223. The next prime is 28168249. The reversal of 28168225 is 52286182.

It is not a de Polignac number, because 28168225 - 2¹ = 28168223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28168223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12027 + ... + 14176.

Almost surely, 2^28168225 is an apocalyptic number.

28168225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28168225 is a deficient number, since it is larger than the sum of its proper divisors (7574031).

28168225 is a wasteful number, since it uses less digits than its factorization.

28168225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26256 (or 26251 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 28168225 is about 5307.3745863657. The cubic root of 28168225 is about 304.2658145116.

The spelling of 28168225 in words is "twenty-eight million, one hundred sixty-eight thousand, two hundred twenty-five".