9876640638878 has 32 divisors (see below), whose sum is σ = 15969301740000. Its totient is φ = 4554242334720.

The previous prime is 9876640638863. The next prime is 9876640638889. The reversal of 9876640638878 is 8788360466789.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393150158 + ... + 393175278.

It is an arithmetic number, because the mean of its divisors is an integer number (499040679375).

Almost surely, 2^{9876640638878} is an apocalyptic number.

9876640638878 is a deficient number, since it is larger than the sum of its proper divisors (6092661101122).

9876640638878 is a wasteful number, since it uses less digits than its factorization.

9876640638878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38492.

The product of its (nonzero) digits is 4682022912, while the sum is 80.

The spelling of 9876640638878 in words is "nine trillion, eight hundred seventy-six billion, six hundred forty million, six hundred thirty-eight thousand, eight hundred seventy-eight".