9909999876 has 24 divisors (see below), whose sum is σ = 26426666560. Its totient is φ = 2831428512.

The previous prime is 9909999871. The next prime is 9909999877. The reversal of 9909999876 is 6789999099.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 9909999798 and 9909999807.

It is not an unprimeable number, because it can be changed into a prime (9909999871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58988011 + ... + 58988178.

Almost surely, 2^9909999876 is an apocalyptic number.

It is an amenable number.

9909999876 is an abundant number, since it is smaller than the sum of its proper divisors (16516666684).

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

9909999876 is a wasteful number, since it uses less digits than its factorization.

9909999876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117976203 (or 117976201 counting only the distinct ones).

The product of its (nonzero) digits is 178564176, while the sum is 75.

The square root of 9909999876 is about 99548.9822951496. The cubic root of 9909999876 is about 2147.9518895556.

The spelling of 9909999876 in words is "nine billion, nine hundred nine million, nine hundred ninety-nine thousand, eight hundred seventy-six".