9947781500 has 48 divisors (see below), whose sum is σ = 21750071616. Its totient is φ = 3974696000.

The previous prime is 9947781491. The next prime is 9947781527. The reversal of 9947781500 is 51877499.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459929 + ... + 481071.

It is an arithmetic number, because the mean of its divisors is an integer number (453126492).

Almost surely, 2^9947781500 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 9947781500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10875035808).

9947781500 is an abundant number, since it is smaller than the sum of its proper divisors (11802290116).

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

9947781500 is a wasteful number, since it uses less digits than its factorization.

9947781500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22103 (or 22091 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 9947781500 is about 99738.5657606926. The cubic root of 9947781500 is about 2150.6780987101.

The spelling of 9947781500 in words is "nine billion, nine hundred forty-seven million, seven hundred eighty-one thousand, five hundred".