9876640638879 has 72 divisors (see below), whose sum is σ = 17036942674752. Its totient is φ = 5494244152320.

The previous prime is 9876640638863. The next prime is 9876640638889. The reversal of 9876640638879 is 9788360466789.

9876640638879 is a `hidden beast` number, since 9 + 8 + 7 + 66 + 406 + 3 + 88 + 79 = 666.

It is not a de Polignac number, because 9876640638879 - 2⁴ = 9876640638863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9876640638798 and 9876640638807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9876640638889) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7781607 + ... + 8961399.

It is an arithmetic number, because the mean of its divisors is an integer number (236624203816).

Almost surely, 2^{9876640638879} is an apocalyptic number.

9876640638879 is a deficient number, since it is larger than the sum of its proper divisors (7160302035873).

9876640638879 is a wasteful number, since it uses less digits than its factorization.

9876640638879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180317 (or 1180307 counting only the distinct ones).

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

The spelling of 9876640638879 in words is "nine trillion, eight hundred seventy-six billion, six hundred forty million, six hundred thirty-eight thousand, eight hundred seventy-nine".