9987911808 has 256 divisors, whose sum is σ = 33215443200. Its totient is φ = 2592866304.

The previous prime is 9987911807. The next prime is 9987911809. The reversal of 9987911808 is 8081197899.

It is an interprime number because it is at equal distance from previous prime (9987911807) and next prime (9987911809).

It is not an unprimeable number, because it can be changed into a prime (9987911807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1321416 + ... + 1328952.

It is an arithmetic number, because the mean of its divisors is an integer number (129747825).

Almost surely, 2^9987911808 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 9987911808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16607721600).

9987911808 is an abundant number, since it is smaller than the sum of its proper divisors (23227531392).

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

9987911808 is a wasteful number, since it uses less digits than its factorization.

9987911808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7595 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 60.

The square root of 9987911808 is about 99939.5407634036. The cubic root of 9987911808 is about 2153.5662326624.

The spelling of 9987911808 in words is "nine billion, nine hundred eighty-seven million, nine hundred eleven thousand, eight hundred eight".