989834992640 has 352 divisors, whose sum is σ = 2713311928320. Its totient is φ = 343459823616.

The previous prime is 989834992639. The next prime is 989834992681. The reversal of 989834992640 is 46299438989.

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, 160606199 + ... + 160612361.

Almost surely, 2^989834992640 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 989834992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1356655964160).

989834992640 is an abundant number, since it is smaller than the sum of its proper divisors (1723476935680).

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

989834992640 is a wasteful number, since it uses less digits than its factorization.

989834992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347 (or 6329 counting only the distinct ones).

The product of its (nonzero) digits is 241864704, while the sum is 71.

The spelling of 989834992640 in words is "nine hundred eighty-nine billion, eight hundred thirty-four million, nine hundred ninety-two thousand, six hundred forty".