28168625 has 8 divisors (see below), whose sum is σ = 35154600. Its totient is φ = 22534800.

The previous prime is 28168601. The next prime is 28168627. The reversal of 28168625 is 52686182.

It can be written as a sum of positive squares in 4 ways, for example, as 2686321 + 25482304 = 1639^2 + 5048^2 .

It is not a de Polignac number, because 28168625 - 2⁶ = 28168561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28168627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112550 + ... + 112799.

It is an arithmetic number, because the mean of its divisors is an integer number (4394325).

Almost surely, 2^28168625 is an apocalyptic number.

28168625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28168625 is a deficient number, since it is larger than the sum of its proper divisors (6985975).

28168625 is an equidigital number, since it uses as much as digits as its factorization.

28168625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225364 (or 225354 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 28168625 is about 5307.4122696470. The cubic root of 28168625 is about 304.2672547366.

The spelling of 28168625 in words is "twenty-eight million, one hundred sixty-eight thousand, six hundred twenty-five".