22644025 has 6 divisors (see below), whose sum is σ = 28078622. Its totient is φ = 18115200.

The previous prime is 22644019. The next prime is 22644047. The reversal of 22644025 is 52044622.

It can be written as a sum of positive squares in 3 ways, for example, as 1447209 + 21196816 = 1203^2 + 4604^2 .

It is not a de Polignac number, because 22644025 - 2¹⁵ = 22611257 is a prime.

It is a super-4 number, since 4×22644025⁴ (a number of 31 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 905761 = 22644025 / (2 + 2 + 6 + 4 + 4 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 452856 + ... + 452905.

Almost surely, 2^22644025 is an apocalyptic number.

22644025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22644025 is a deficient number, since it is larger than the sum of its proper divisors (5434597).

22644025 is an equidigital number, since it uses as much as digits as its factorization.

22644025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905771 (or 905766 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 22644025 is about 4758.5738409738. The cubic root of 22644025 is about 282.9118955596.

Adding to 22644025 its reverse (52044622), we get a palindrome (74688647).

The spelling of 22644025 in words is "twenty-two million, six hundred forty-four thousand, twenty-five".