22621440 has 144 divisors (see below), whose sum is σ = 74467008. Its totient is φ = 5849088.

The previous prime is 22621439. The next prime is 22621447. The reversal of 22621440 is 4412622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22621447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165052 + ... + 165188.

It is an arithmetic number, because the mean of its divisors is an integer number (517132).

Almost surely, 2^22621440 is an apocalyptic number.

22621440 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 22621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37233504).

22621440 is an abundant number, since it is smaller than the sum of its proper divisors (51845568).

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

22621440 is a wasteful number, since it uses less digits than its factorization.

22621440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 22621440 is about 4756.2001639965. The cubic root of 22621440 is about 282.8178061233.

The spelling of 22621440 in words is "twenty-two million, six hundred twenty-one thousand, four hundred forty".