998981015040 has 960 divisors, whose sum is σ = 3879022530240. Its totient is φ = 236118343680.

The previous prime is 998981014981. The next prime is 998981015101. The reversal of 998981015040 is 40510189899.

It is a tau number, because it is divible by the number of its divisors (960).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1793502442 + ... + 1793502998.

It is an arithmetic number, because the mean of its divisors is an integer number (4040648469).

Almost surely, 2^998981015040 is an apocalyptic number.

998981015040 is a gapful number since it is divisible by the number (90) 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 998981015040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1939511265120).

998981015040 is an abundant number, since it is smaller than the sum of its proper divisors (2880041515200).

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

998981015040 is a wasteful number, since it uses less digits than its factorization.

998981015040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 998981015040 in words is "nine hundred ninety-eight billion, nine hundred eighty-one million, fifteen thousand, forty".