9986329978 has 8 divisors (see below), whose sum is σ = 14998013460. Its totient is φ = 4986992160.

The previous prime is 9986329949. The next prime is 9986329979. The reversal of 9986329978 is 8799236899.

It can be written as a sum of positive squares in 2 ways, for example, as 9955449729 + 30880249 = 99777^2 + 5557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (9986329979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3084393 + ... + 3087628.

Almost surely, 2^9986329978 is an apocalyptic number.

9986329978 is a deficient number, since it is larger than the sum of its proper divisors (5011683482).

9986329978 is a wasteful number, since it uses less digits than its factorization.

9986329978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172832.

The product of its digits is 105815808, while the sum is 70.

The square root of 9986329978 is about 99931.6265153330. The cubic root of 9986329978 is about 2153.4525367069.

The spelling of 9986329978 in words is "nine billion, nine hundred eighty-six million, three hundred twenty-nine thousand, nine hundred seventy-eight".