9947215872 has 288 divisors, whose sum is σ = 31828567680. Its totient is φ = 2967552000.

The previous prime is 9947215829. The next prime is 9947215909. The reversal of 9947215872 is 2785127499.

9947215872 is a `hidden beast` number, since 99 + 472 + 1 + 5 + 87 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14395047 + ... + 14395737.

It is an arithmetic number, because the mean of its divisors is an integer number (110515860).

Almost surely, 2^9947215872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9947215872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15914283840).

9947215872 is an abundant number, since it is smaller than the sum of its proper divisors (21881351808).

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

9947215872 is a wasteful number, since it uses less digits than its factorization.

9947215872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 778 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 9947215872 is about 99735.7301672776. The cubic root of 9947215872 is about 2150.6373356245.

The spelling of 9947215872 in words is "nine billion, nine hundred forty-seven million, two hundred fifteen thousand, eight hundred seventy-two".