8447742720 has 360 divisors, whose sum is σ = 30762159120. Its totient is φ = 2212945920.

The previous prime is 8447742691. The next prime is 8447742733. The reversal of 8447742720 is 272477448.

It is a tau number, because it is divible by the number of its divisors (360).

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6116430 + ... + 6117810.

It is an arithmetic number, because the mean of its divisors is an integer number (85450442).

Almost surely, 2^8447742720 is an apocalyptic number.

8447742720 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 8447742720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15381079560).

8447742720 is an abundant number, since it is smaller than the sum of its proper divisors (22314416400).

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

8447742720 is a wasteful number, since it uses less digits than its factorization.

8447742720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1450 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 45.

The square root of 8447742720 is about 91911.6027495985. The cubic root of 8447742720 is about 2036.6366724960.

The spelling of 8447742720 in words is "eight billion, four hundred forty-seven million, seven hundred forty-two thousand, seven hundred twenty".