22225500 has 144 divisors (see below), whose sum is σ = 76658400. Its totient is φ = 5376000.

The previous prime is 22225499. The next prime is 22225517. The reversal of 22225500 is 552222.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49276 + ... + 49724.

It is an arithmetic number, because the mean of its divisors is an integer number (532350).

Almost surely, 2^22225500 is an apocalyptic number.

22225500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22225500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38329200).

22225500 is an abundant number, since it is smaller than the sum of its proper divisors (54432900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22225500 is a wasteful number, since it uses less digits than its factorization.

22225500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 22225500 is about 4714.3928559254. The cubic root of 22225500 is about 281.1580440119.

Adding to 22225500 its reverse (552222), we get a palindrome (22777722).

It can be divided in two parts, 22 and 225500, that added together give a palindrome (225522).

The spelling of 22225500 in words is "twenty-two million, two hundred twenty-five thousand, five hundred".