987905868509788 has 6 divisors (see below), whose sum is σ = 1728835269892136. Its totient is φ = 493952934254892.

The previous prime is 987905868509783. The next prime is 987905868509827. The reversal of 987905868509788 is 887905868509789.

987905868509788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 987905868509788.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987905868509783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123488233563720 + ... + 123488233563727.

Almost surely, 2^{987905868509788} is an apocalyptic number.

It is an amenable number.

987905868509788 is a deficient number, since it is larger than the sum of its proper divisors (740929401382348).

987905868509788 is a wasteful number, since it uses less digits than its factorization.

987905868509788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246976467127451 (or 246976467127449 counting only the distinct ones).

The product of its (nonzero) digits is 175575859200, while the sum is 97.

Subtracting from 987905868509788 its reverse (887905868509789), we obtain a palindrome (99999999999999).

The spelling of 987905868509788 in words is "nine hundred eighty-seven trillion, nine hundred five billion, eight hundred sixty-eight million, five hundred nine thousand, seven hundred eighty-eight".