9988236478 has 16 divisors (see below), whose sum is σ = 16345923696. Its totient is φ = 4539680640.

The previous prime is 9988236397. The next prime is 9988236481. The reversal of 9988236478 is 8746328899.

9988236478 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 7 ways as a sum of consecutive naturals, for example, 431200 + ... + 453772.

It is an arithmetic number, because the mean of its divisors is an integer number (1021620231).

Almost surely, 2^9988236478 is an apocalyptic number.

9988236478 is a deficient number, since it is larger than the sum of its proper divisors (6357687218).

9988236478 is a wasteful number, since it uses less digits than its factorization.

9988236478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42699.

The product of its digits is 41803776, while the sum is 64.

The square root of 9988236478 is about 99941.1650822623. The cubic root of 9988236478 is about 2153.5895672287.

The spelling of 9988236478 in words is "nine billion, nine hundred eighty-eight million, two hundred thirty-six thousand, four hundred seventy-eight".