9999171828 has 72 divisors (see below), whose sum is σ = 25543758240. Its totient is φ = 3297787200.

The previous prime is 9999171827. The next prime is 9999171829. The reversal of 9999171828 is 8281719999.

It is an interprime number because it is at equal distance from previous prime (9999171827) and next prime (9999171829).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999171827) 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 23 ways as a sum of consecutive naturals, for example, 5588358 + ... + 5590146.

It is an arithmetic number, because the mean of its divisors is an integer number (354774420).

Almost surely, 2^9999171828 is an apocalyptic number.

It is an amenable number.

9999171828 is an abundant number, since it is smaller than the sum of its proper divisors (15544586412).

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

9999171828 is a wasteful number, since it uses less digits than its factorization.

9999171828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357 (or 3352 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 63.

The square root of 9999171828 is about 99995.8590542628. The cubic root of 9999171828 is about 2154.3752136404.

It can be divided in two parts, 9999171 and 828, that added together give a palindrome (9999999).

The spelling of 9999171828 in words is "nine billion, nine hundred ninety-nine million, one hundred seventy-one thousand, eight hundred twenty-eight".