9991755904 has 96 divisors (see below), whose sum is σ = 21716024400. Its totient is φ = 4577025024.

The previous prime is 9991755901. The next prime is 9991755911. The reversal of 9991755904 is 4095571999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9991755901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3005187 + ... + 3008509.

Almost surely, 2^9991755904 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 9991755904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10858012200).

9991755904 is an abundant number, since it is smaller than the sum of its proper divisors (11724268496).

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

9991755904 is a wasteful number, since it uses less digits than its factorization.

9991755904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3502 (or 3477 counting only the distinct ones).

The product of its (nonzero) digits is 4592700, while the sum is 58.

The square root of 9991755904 is about 99958.7710208564. The cubic root of 9991755904 is about 2153.8424817143.

The spelling of 9991755904 in words is "nine billion, nine hundred ninety-one million, seven hundred fifty-five thousand, nine hundred four".