988491999840 has 192 divisors, whose sum is σ = 3154672604160. Its totient is φ = 260136714240.

The previous prime is 988491999839. The next prime is 988491999877. The reversal of 988491999840 is 48999194889.

988491999840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×988491999840³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100748535 + ... + 100758345.

It is an arithmetic number, because the mean of its divisors is an integer number (16430586480).

Almost surely, 2^988491999840 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 988491999840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577336302080).

988491999840 is an abundant number, since it is smaller than the sum of its proper divisors (2166180604320).

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

988491999840 is a wasteful number, since it uses less digits than its factorization.

988491999840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565 (or 12557 counting only the distinct ones).

The product of its (nonzero) digits is 483729408, while the sum is 78.

The spelling of 988491999840 in words is "nine hundred eighty-eight billion, four hundred ninety-one million, nine hundred ninety-nine thousand, eight hundred forty".