8447221440 has 336 divisors, whose sum is σ = 33754893120. Its totient is φ = 1898864640.

The previous prime is 8447221417. The next prime is 8447221463. The reversal of 8447221440 is 441227448.

It is an interprime number because it is at equal distance from previous prime (8447221417) and next prime (8447221463).

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8447221395 and 8447221404.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1226326 + ... + 1233194.

Almost surely, 2^8447221440 is an apocalyptic number.

8447221440 is a gapful number since it is divisible by the number (80) 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 8447221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16877446560).

8447221440 is an abundant number, since it is smaller than the sum of its proper divisors (25307671680).

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

8447221440 is a wasteful number, since it uses less digits than its factorization.

8447221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6960 (or 6947 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 36.

The square root of 8447221440 is about 91908.7669376540. The cubic root of 8447221440 is about 2036.5947804451.

Adding to 8447221440 its reverse (441227448), we get a palindrome (8888448888).

The spelling of 8447221440 in words is "eight billion, four hundred forty-seven million, two hundred twenty-one thousand, four hundred forty".