9987312687 has 16 divisors (see below), whose sum is σ = 14995614720. Its totient is φ = 5857660800.

The previous prime is 9987312679. The next prime is 9987312689. The reversal of 9987312687 is 7862137899.

It is not a de Polignac number, because 9987312687 - 2³ = 9987312679 is a prime.

It is a super-2 number, since 2×9987312687² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9987312687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987312689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4880362 + ... + 4882407.

It is an arithmetic number, because the mean of its divisors is an integer number (937225920).

Almost surely, 2^9987312687 is an apocalyptic number.

9987312687 is a deficient number, since it is larger than the sum of its proper divisors (5008302033).

9987312687 is a wasteful number, since it uses less digits than its factorization.

9987312687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9762814.

The product of its digits is 9144576, while the sum is 60.

The square root of 9987312687 is about 99936.5433012369. The cubic root of 9987312687 is about 2153.5231715241.

The spelling of 9987312687 in words is "nine billion, nine hundred eighty-seven million, three hundred twelve thousand, six hundred eighty-seven".