22281489720 has 480 divisors, whose sum is σ = 87597417600. Its totient is φ = 5064933888.

The previous prime is 22281489719. The next prime is 22281489743. The reversal of 22281489720 is 2798418222.

It is a happy number.

22281489720 is a `hidden beast` number, since 2 + 22 + 81 + 489 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 46516441 + ... + 46516919.

It is an arithmetic number, because the mean of its divisors is an integer number (182494620).

Almost surely, 2^22281489720 is an apocalyptic number.

22281489720 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 22281489720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43798708800).

22281489720 is an abundant number, since it is smaller than the sum of its proper divisors (65315927880).

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

22281489720 is a wasteful number, since it uses less digits than its factorization.

22281489720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 22281489720 in words is "twenty-two billion, two hundred eighty-one million, four hundred eighty-nine thousand, seven hundred twenty".