28245225 has 12 divisors (see below), whose sum is σ = 46698896. Its totient is φ = 15064080.

The previous prime is 28245199. The next prime is 28245227. The reversal of 28245225 is 52254282.

It is not a de Polignac number, because 28245225 - 2¹⁰ = 28244201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28245192 and 28245201.

It is not an unprimeable number, because it can be changed into a prime (28245227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188227 + ... + 188376.

Almost surely, 2^28245225 is an apocalyptic number.

28245225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28245225 is a deficient number, since it is larger than the sum of its proper divisors (18453671).

28245225 is a wasteful number, since it uses less digits than its factorization.

28245225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376616 (or 376611 counting only the distinct ones).

The product of its digits is 12800, while the sum is 30.

The square root of 28245225 is about 5314.6236931696. The cubic root of 28245225 is about 304.5428069057.

The spelling of 28245225 in words is "twenty-eight million, two hundred forty-five thousand, two hundred twenty-five".