28185225 has 48 divisors (see below), whose sum is σ = 48568320. Its totient is φ = 14414400.

The previous prime is 28185211. The next prime is 28185239. The reversal of 28185225 is 52258182.

It is an interprime number because it is at equal distance from previous prime (28185211) and next prime (28185239).

It is not a de Polignac number, because 28185225 - 2⁸ = 28184969 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 356736 + ... + 356814.

It is an arithmetic number, because the mean of its divisors is an integer number (1011840).

Almost surely, 2^28185225 is an apocalyptic number.

28185225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28185225 is a deficient number, since it is larger than the sum of its proper divisors (20383095).

28185225 is a wasteful number, since it uses less digits than its factorization.

28185225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 225 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 28185225 is about 5308.9758899434. The cubic root of 28185225 is about 304.3270120563.

The spelling of 28185225 in words is "twenty-eight million, one hundred eighty-five thousand, two hundred twenty-five".