28185125 has 16 divisors (see below), whose sum is σ = 35323392. Its totient is φ = 22453200.

The previous prime is 28185121. The next prime is 28185137. The reversal of 28185125 is 52158182.

It is a happy number.

It is not a de Polignac number, because 28185125 - 2² = 28185121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28185091 and 28185100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28185121) 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 15 ways as a sum of consecutive naturals, for example, 57632 + ... + 58118.

It is an arithmetic number, because the mean of its divisors is an integer number (2207712).

Almost surely, 2^28185125 is an apocalyptic number.

28185125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28185125 is a deficient number, since it is larger than the sum of its proper divisors (7138267).

28185125 is an equidigital number, since it uses as much as digits as its factorization.

28185125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 955 counting only the distinct ones).

The product of its digits is 6400, while the sum is 32.

The square root of 28185125 is about 5308.9664719228. The cubic root of 28185125 is about 304.3266521427.

The spelling of 28185125 in words is "twenty-eight million, one hundred eighty-five thousand, one hundred twenty-five".