9997538880 has 448 divisors, whose sum is σ = 38188270080. Its totient is φ = 2170183680.

The previous prime is 9997538879. The next prime is 9997538939. The reversal of 9997538880 is 888357999.

It is a tau number, because it is divible by the number of its divisors (448).

It is a super-2 number, since 2×9997538880² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 163894050 + ... + 163894110.

Almost surely, 2^9997538880 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 9997538880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19094135040).

9997538880 is an abundant number, since it is smaller than the sum of its proper divisors (28190731200).

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

9997538880 is an equidigital number, since it uses as much as digits as its factorization.

9997538880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 66.

The square root of 9997538880 is about 99987.6936427679. The cubic root of 9997538880 is about 2154.2579314535.

The spelling of 9997538880 in words is "nine billion, nine hundred ninety-seven million, five hundred thirty-eight thousand, eight hundred eighty".