9987777716 has 24 divisors (see below), whose sum is σ = 19990244736. Its totient is φ = 4277328480.

The previous prime is 9987777707. The next prime is 9987777727. The reversal of 9987777716 is 6177777899.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92195 + ... + 168746.

It is an arithmetic number, because the mean of its divisors is an integer number (832926864).

Almost surely, 2^9987777716 is an apocalyptic number.

It is an amenable number.

9987777716 is an abundant number, since it is smaller than the sum of its proper divisors (10002467020).

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

9987777716 is a wasteful number, since it uses less digits than its factorization.

9987777716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262319 (or 262317 counting only the distinct ones).

The product of its digits is 65345616, while the sum is 68.

The square root of 9987777716 is about 99938.8698955517. The cubic root of 9987777716 is about 2153.5565951024.

The spelling of 9987777716 in words is "nine billion, nine hundred eighty-seven million, seven hundred seventy-seven thousand, seven hundred sixteen".