998517888 has 192 divisors, whose sum is σ = 3033928800. Its totient is φ = 323255808.

The previous prime is 998517881. The next prime is 998517907. The reversal of 998517888 is 888715899.

It is a tau number, because it is divible by the number of its divisors (192).

Its product of digits (11612160) is a multiple of the sum of its prime factors (224).

It is not an unprimeable number, because it can be changed into a prime (998517881) by changing a digit.

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, 12030295 + ... + 12030377.

Almost surely, 2^998517888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998517888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516964400).

998517888 is an abundant number, since it is smaller than the sum of its proper divisors (2035410912).

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

998517888 is an equidigital number, since it uses as much as digits as its factorization.

998517888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 147 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 63.

The square root of 998517888 is about 31599.3336638607. Note that the first 3 decimals coincide. The cubic root of 998517888 is about 999.5057183926.

The spelling of 998517888 in words is "nine hundred ninety-eight million, five hundred seventeen thousand, eight hundred eighty-eight".