28551225 has 24 divisors (see below), whose sum is σ = 48836160. Its totient is φ = 14701120.

The previous prime is 28551223. The next prime is 28551227. The reversal of 28551225 is 52215582.

It is an interprime number because it is at equal distance from previous prime (28551223) and next prime (28551227).

It is not a de Polignac number, because 28551225 - 2¹ = 28551223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28551192 and 28551201.

It is not an unprimeable number, because it can be changed into a prime (28551223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4389 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (2034840).

Almost surely, 2^28551225 is an apocalyptic number.

28551225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28551225 is a deficient number, since it is larger than the sum of its proper divisors (20284935).

28551225 is a wasteful number, since it uses less digits than its factorization.

28551225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13169 (or 13164 counting only the distinct ones).

The product of its digits is 8000, while the sum is 30.

The square root of 28551225 is about 5343.3346329797. The cubic root of 28551225 is about 305.6386331798.

The spelling of 28551225 in words is "twenty-eight million, five hundred fifty-one thousand, two hundred twenty-five".