22224640 has 72 divisors (see below), whose sum is σ = 54084240. Its totient is φ = 8749056.

The previous prime is 22224617. The next prime is 22224667. The reversal of 22224640 is 4642222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124071 + ... + 124249.

It is an arithmetic number, because the mean of its divisors is an integer number (751170).

Almost surely, 2^22224640 is an apocalyptic number.

22224640 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 22224640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27042120).

22224640 is an abundant number, since it is smaller than the sum of its proper divisors (31859600).

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

22224640 is an equidigital number, since it uses as much as digits as its factorization.

22224640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 22224640 is about 4714.3016449947. The cubic root of 22224640 is about 281.1544175613.

Adding to 22224640 its reverse (4642222), we get a palindrome (26866862).

The spelling of 22224640 in words is "twenty-two million, two hundred twenty-four thousand, six hundred forty".