28361225 has 6 divisors (see below), whose sum is σ = 35167950. Its totient is φ = 22688960.

The previous prime is 28361213. The next prime is 28361227. The reversal of 28361225 is 52216382.

It can be written as a sum of positive squares in 3 ways, for example, as 26896 + 28334329 = 164^2 + 5323^2 .

It is not a de Polignac number, because 28361225 - 2⁶ = 28361161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28361227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567200 + ... + 567249.

It is an arithmetic number, because the mean of its divisors is an integer number (5861325).

Almost surely, 2^28361225 is an apocalyptic number.

28361225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28361225 is a deficient number, since it is larger than the sum of its proper divisors (6806725).

28361225 is a wasteful number, since it uses less digits than its factorization.

28361225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134459 (or 1134454 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 28361225 is about 5325.5257956375. The cubic root of 28361225 is about 304.9591452937.

The spelling of 28361225 in words is "twenty-eight million, three hundred sixty-one thousand, two hundred twenty-five".