28350225 has 18 divisors (see below), whose sum is σ = 50778806. Its totient is φ = 15120000.

The previous prime is 28350221. The next prime is 28350233. The reversal of 28350225 is 52205382.

It can be written as a sum of positive squares in 3 ways, for example, as 1382976 + 26967249 = 1176^2 + 5193^2 .

It is not a de Polignac number, because 28350225 - 2² = 28350221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28350221) 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 17 ways as a sum of consecutive naturals, for example, 62776 + ... + 63225.

Almost surely, 2^28350225 is an apocalyptic number.

28350225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28350225 is a deficient number, since it is larger than the sum of its proper divisors (22428581).

28350225 is a wasteful number, since it uses less digits than its factorization.

28350225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126017 (or 126009 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 28350225 is about 5324.4929336041. The cubic root of 28350225 is about 304.9197137061.

The spelling of 28350225 in words is "twenty-eight million, three hundred fifty thousand, two hundred twenty-five".