989518083840 has 864 divisors, whose sum is σ = 4171322727936. Its totient is φ = 221420666880.

The previous prime is 989518083821. The next prime is 989518083871. The reversal of 989518083840 is 48380815989.

It is a happy number.

989518083840 is a `hidden beast` number, since 9 + 89 + 518 + 0 + 8 + 38 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 44467597 + ... + 44489843.

It is an arithmetic number, because the mean of its divisors is an integer number (4827919824).

Almost surely, 2^989518083840 is an apocalyptic number.

989518083840 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 989518083840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2085661363968).

989518083840 is an abundant number, since it is smaller than the sum of its proper divisors (3181804644096).

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

989518083840 is a wasteful number, since it uses less digits than its factorization.

989518083840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22307 (or 22281 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 989518083840 in words is "nine hundred eighty-nine billion, five hundred eighteen million, eighty-three thousand, eight hundred forty".