9978826368 has 128 divisors (see below), whose sum is σ = 31610142720. Its totient is φ = 2727115776.

The previous prime is 9978826367. The next prime is 9978826387. The reversal of 9978826368 is 8636288799.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-4 number, since 4×9978826368⁴ (a number of 41 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9978826299 and 9978826308.

It is not an unprimeable number, because it can be changed into a prime (9978826367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18880 + ... + 142527.

It is an arithmetic number, because the mean of its divisors is an integer number (246954240).

Almost surely, 2^9978826368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9978826368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15805071360).

9978826368 is an abundant number, since it is smaller than the sum of its proper divisors (21631316352).

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

9978826368 is a wasteful number, since it uses less digits than its factorization.

9978826368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161454 (or 161442 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 66.

The square root of 9978826368 is about 99894.0757402560. The cubic root of 9978826368 is about 2152.9130419890.

The spelling of 9978826368 in words is "nine billion, nine hundred seventy-eight million, eight hundred twenty-six thousand, three hundred sixty-eight".