9999544320 has 156 divisors (see below), whose sum is σ = 34661494296. Its totient is φ = 2666496000.

The previous prime is 9999544309. The next prime is 9999544339. The reversal of 9999544320 is 234459999.

9999544320 is a `hidden beast` number, since 9 + 9 + 99 + 544 + 3 + 2 + 0 = 666.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157195 + ... + 211445.

It is an arithmetic number, because the mean of its divisors is an integer number (222189066).

Almost surely, 2^9999544320 is an apocalyptic number.

9999544320 is a gapful number since it is divisible by the number (90) 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 9999544320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17330747148).

9999544320 is an abundant number, since it is smaller than the sum of its proper divisors (24661949976).

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

9999544320 is a wasteful number, since it uses less digits than its factorization.

9999544320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54286 (or 54261 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The square root of 9999544320 is about 99997.7215740439. The cubic root of 9999544320 is about 2154.4019651082.

The spelling of 9999544320 in words is "nine billion, nine hundred ninety-nine million, five hundred forty-four thousand, three hundred twenty".