998889432912 has 480 divisors, whose sum is σ = 3715682181120. Its totient is φ = 243405803520.

The previous prime is 998889432899. The next prime is 998889432917. The reversal of 998889432912 is 219234988899.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998889432917) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7421737 + ... + 7555127.

It is an arithmetic number, because the mean of its divisors is an integer number (7741004544).

Almost surely, 2^998889432912 is an apocalyptic number.

998889432912 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998889432912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1857841090560).

998889432912 is an abundant number, since it is smaller than the sum of its proper divisors (2716792748208).

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

998889432912 is a wasteful number, since it uses less digits than its factorization.

998889432912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133471 (or 133462 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 72.

The spelling of 998889432912 in words is "nine hundred ninety-eight billion, eight hundred eighty-nine million, four hundred thirty-two thousand, nine hundred twelve".