9876640638798 has 24 divisors (see below), whose sum is σ = 21803150091528. Its totient is φ = 3230096309232.

The previous prime is 9876640638791. The next prime is 9876640638803. The reversal of 9876640638798 is 8978360466789.

9876640638798 is a `hidden beast` number, since 9 + 87 + 66 + 406 + 3 + 8 + 79 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9876640638791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5176435440 + ... + 5176437347.

It is an arithmetic number, because the mean of its divisors is an integer number (908464587147).

Almost surely, 2^{9876640638798} is an apocalyptic number.

9876640638798 is an abundant number, since it is smaller than the sum of its proper divisors (11926509452730).

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

9876640638798 is a wasteful number, since it uses less digits than its factorization.

9876640638798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10352872848 (or 10352872845 counting only the distinct ones).

The product of its (nonzero) digits is 5267275776, while the sum is 81.

The spelling of 9876640638798 in words is "nine trillion, eight hundred seventy-six billion, six hundred forty million, six hundred thirty-eight thousand, seven hundred ninety-eight".