9998888667 has 16 divisors (see below), whose sum is σ = 13509999360. Its totient is φ = 6577320672.

The previous prime is 9998888659. The next prime is 9998888671. The reversal of 9998888667 is 7668888999.

It is not a de Polignac number, because 9998888667 - 2³ = 9998888659 is a prime.

It is a super-2 number, since 2×9998888667² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9998888592 and 9998888601.

It is not an unprimeable number, because it can be changed into a prime (9998888687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27184 + ... + 144002.

It is an arithmetic number, because the mean of its divisors is an integer number (844374960).

Almost surely, 2^9998888667 is an apocalyptic number.

9998888667 is a deficient number, since it is larger than the sum of its proper divisors (3511110693).

9998888667 is a wasteful number, since it uses less digits than its factorization.

9998888667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117202.

The product of its digits is 752467968, while the sum is 78.

The square root of 9998888667 is about 99994.4431806088. The cubic root of 9998888667 is about 2154.3548772629.

The spelling of 9998888667 in words is "nine billion, nine hundred ninety-eight million, eight hundred eighty-eight thousand, six hundred sixty-seven".