22144307440 has 80 divisors (see below), whose sum is σ = 54815866560. Its totient is φ = 8290529280.

The previous prime is 22144307401. The next prime is 22144307443. The reversal of 22144307440 is 4470344122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22144307443) 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, 201181 + ... + 291139.

It is an arithmetic number, because the mean of its divisors is an integer number (685198332).

Almost surely, 2^22144307440 is an apocalyptic number.

22144307440 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 22144307440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27407933280).

22144307440 is an abundant number, since it is smaller than the sum of its proper divisors (32671559120).

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

22144307440 is a wasteful number, since it uses less digits than its factorization.

22144307440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90170 (or 90164 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 31.

The spelling of 22144307440 in words is "twenty-two billion, one hundred forty-four million, three hundred seven thousand, four hundred forty".