9938697678 has 96 divisors (see below), whose sum is σ = 27332294400. Its totient is φ = 2621178144.

The previous prime is 9938697611. The next prime is 9938697683. The reversal of 9938697678 is 8767968399.

9938697678 is a `hidden beast` number, since 99 + 386 + 97 + 6 + 78 = 666.

9938697678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13908 + ... + 141671.

It is an arithmetic number, because the mean of its divisors is an integer number (284711400).

Almost surely, 2^9938697678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9938697678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13666147200).

9938697678 is an abundant number, since it is smaller than the sum of its proper divisors (17393596722).

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

9938697678 is a wasteful number, since it uses less digits than its factorization.

9938697678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155623 (or 155604 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 72.

The square root of 9938697678 is about 99693.0171977958. The cubic root of 9938697678 is about 2150.0232683979.

The spelling of 9938697678 in words is "nine billion, nine hundred thirty-eight million, six hundred ninety-seven thousand, six hundred seventy-eight".