9999888776 has 8 divisors (see below), whose sum is σ = 18749791470. Its totient is φ = 4999944384.

The previous prime is 9999888751. The next prime is 9999888781. The reversal of 9999888776 is 6778889999.

It can be written as a sum of positive squares in only one way, i.e., 9225602500 + 774286276 = 96050^2 + 27826^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999888776.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624993041 + ... + 624993056.

Almost surely, 2^9999888776 is an apocalyptic number.

It is an amenable number.

9999888776 is a deficient number, since it is larger than the sum of its proper divisors (8749902694).

9999888776 is a wasteful number, since it uses less digits than its factorization.

9999888776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249986103 (or 1249986099 counting only the distinct ones).

The product of its digits is 987614208, while the sum is 80.

The square root of 9999888776 is about 99999.4438784536. The cubic root of 9999888776 is about 2154.4267025075.

The spelling of 9999888776 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-eight thousand, seven hundred seventy-six".