9998989705 has 32 divisors (see below), whose sum is σ = 13468999680. Its totient is φ = 7088808960.

The previous prime is 9998989687. The next prime is 9998989757. The reversal of 9998989705 is 5079898999.

It is not a de Polignac number, because 9998989705 - 2¹⁵ = 9998956937 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 46216 + ... + 148774.

It is an arithmetic number, because the mean of its divisors is an integer number (420906240).

Almost surely, 2^9998989705 is an apocalyptic number.

It is an amenable number.

9998989705 is a deficient number, since it is larger than the sum of its proper divisors (3470009975).

9998989705 is a wasteful number, since it uses less digits than its factorization.

9998989705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102649.

The product of its (nonzero) digits is 132269760, while the sum is 73.

The square root of 9998989705 is about 99994.9483974066. The cubic root of 9998989705 is about 2154.3621337685.

The spelling of 9998989705 in words is "nine billion, nine hundred ninety-eight million, nine hundred eighty-nine thousand, seven hundred five".