28225605 has 16 divisors (see below), whose sum is σ = 45601920. Its totient is φ = 14906688.

The previous prime is 28225597. The next prime is 28225609. The reversal of 28225605 is 50652282.

It is not a de Polignac number, because 28225605 - 2³ = 28225597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28225609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7590 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (2850120).

Almost surely, 2^28225605 is an apocalyptic number.

It is an amenable number.

28225605 is a deficient number, since it is larger than the sum of its proper divisors (17376315).

28225605 is a wasteful number, since it uses less digits than its factorization.

28225605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18380.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 28225605 is about 5312.7775221630. Note that the first 3 decimals coincide. The cubic root of 28225605 is about 304.4722756459.

Adding to 28225605 its reverse (50652282), we get a palindrome (78877887).

The spelling of 28225605 in words is "twenty-eight million, two hundred twenty-five thousand, six hundred five".