9978723396 has 60 divisors (see below), whose sum is σ = 26132053948. Its totient is φ = 3320414208.

The previous prime is 9978723353. The next prime is 9978723413. The reversal of 9978723396 is 6933278799.

It can be written as a sum of positive squares in 2 ways, for example, as 9944078400 + 34644996 = 99720^2 + 5886^2 .

It is a super-2 number, since 2×9978723396² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 160260 + ... + 213636.

Almost surely, 2^9978723396 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 9978723396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13066026974).

9978723396 is an abundant number, since it is smaller than the sum of its proper divisors (16153330552).

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

9978723396 is a wasteful number, since it uses less digits than its factorization.

9978723396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53970 (or 53959 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 63.

The square root of 9978723396 is about 99893.5603329864. The cubic root of 9978723396 is about 2152.9056366250.

The spelling of 9978723396 in words is "nine billion, nine hundred seventy-eight million, seven hundred twenty-three thousand, three hundred ninety-six".