22640225 has 12 divisors (see below), whose sum is σ = 28222524. Its totient is φ = 18016320.

The previous prime is 22640221. The next prime is 22640249. The reversal of 22640225 is 52204622.

22640225 = 512² + 513² + ... + 586².

It can be written as a sum of positive squares in 6 ways, for example, as 134689 + 22505536 = 367^2 + 4744^2 .

It is not a de Polignac number, because 22640225 - 2² = 22640221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22640225.

It is not an unprimeable number, because it can be changed into a prime (22640221) 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 11 ways as a sum of consecutive naturals, for example, 2627 + ... + 7223.

It is an arithmetic number, because the mean of its divisors is an integer number (2351877).

Almost surely, 2^22640225 is an apocalyptic number.

22640225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22640225 is a deficient number, since it is larger than the sum of its proper divisors (5582299).

22640225 is a wasteful number, since it uses less digits than its factorization.

22640225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4804 (or 4799 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 22640225 is about 4758.1745449279. The cubic root of 22640225 is about 282.8960690837.

Adding to 22640225 its reverse (52204622), we get a palindrome (74844847).

The spelling of 22640225 in words is "twenty-two million, six hundred forty thousand, two hundred twenty-five".