989609187840 has 1280 divisors, whose sum is σ = 4009903349760. Its totient is φ = 202675322880.

The previous prime is 989609187817. The next prime is 989609187859. The reversal of 989609187840 is 48781906989.

It is a tau number, because it is divible by the number of its divisors (1280).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5925803437 + ... + 5925803603.

It is an arithmetic number, because the mean of its divisors is an integer number (3132736992).

Almost surely, 2^989609187840 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 989609187840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2004951674880).

989609187840 is an abundant number, since it is smaller than the sum of its proper divisors (3020294161920).

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

989609187840 is a wasteful number, since it uses less digits than its factorization.

989609187840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 69.

The spelling of 989609187840 in words is "nine hundred eighty-nine billion, six hundred nine million, one hundred eighty-seven thousand, eight hundred forty".