28225207 has 4 divisors (see below), whose sum is σ = 29198520. Its totient is φ = 27251896.

The previous prime is 28225189. The next prime is 28225217. The reversal of 28225207 is 70252282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28225207 - 2¹⁹ = 27700919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28225217) 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 3 ways as a sum of consecutive naturals, for example, 486613 + ... + 486670.

It is an arithmetic number, because the mean of its divisors is an integer number (7299630).

Almost surely, 2^28225207 is an apocalyptic number.

28225207 is a deficient number, since it is larger than the sum of its proper divisors (973313).

28225207 is an equidigital number, since it uses as much as digits as its factorization.

28225207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973312.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 28225207 is about 5312.7400651641. The cubic root of 28225207 is about 304.4708445513.

Adding to 28225207 its reverse (70252282), we get a palindrome (98477489).

The spelling of 28225207 in words is "twenty-eight million, two hundred twenty-five thousand, two hundred seven".