990673581720 has 128 divisors (see below), whose sum is σ = 3021291000000. Its totient is φ = 259801620480.

The previous prime is 990673581649. The next prime is 990673581721. The reversal of 990673581720 is 27185376099.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990673581721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60960156 + ... + 60976404.

Almost surely, 2^990673581720 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 990673581720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1510645500000).

990673581720 is an abundant number, since it is smaller than the sum of its proper divisors (2030617418280).

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

990673581720 is a wasteful number, since it uses less digits than its factorization.

990673581720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24653 (or 24649 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 57.

The spelling of 990673581720 in words is "nine hundred ninety billion, six hundred seventy-three million, five hundred eighty-one thousand, seven hundred twenty".