9999888705 has 24 divisors (see below), whose sum is σ = 17892276480. Its totient is φ = 5161232160.

The previous prime is 9999888677. The next prime is 9999888719. The reversal of 9999888705 is 5078889999.

It is not a de Polignac number, because 9999888705 - 2¹¹ = 9999886657 is a prime.

It is a super-2 number, since 2×9999888705² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3582795 + ... + 3585584.

It is an arithmetic number, because the mean of its divisors is an integer number (745511520).

Almost surely, 2^9999888705 is an apocalyptic number.

It is an amenable number.

9999888705 is a deficient number, since it is larger than the sum of its proper divisors (7892387775).

9999888705 is a wasteful number, since it uses less digits than its factorization.

9999888705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7168421 (or 7168418 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 72.

The square root of 9999888705 is about 99999.4435234517. The cubic root of 9999888705 is about 2154.4266974086.

It can be divided in two parts, 9999 and 888705, that added together give a square (898704 = 948²).

The spelling of 9999888705 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-eight thousand, seven hundred five".