990488432640 has 416 divisors, whose sum is σ = 3645233521920. Its totient is φ = 224939999232.

The previous prime is 990488432639. The next prime is 990488432651. The reversal of 990488432640 is 46234884099.

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, 67515226 + ... + 67529894.

Almost surely, 2^990488432640 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 990488432640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1822616760960).

990488432640 is an abundant number, since it is smaller than the sum of its proper divisors (2654745089280).

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

990488432640 is a wasteful number, since it uses less digits than its factorization.

990488432640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14865 (or 14843 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 57.

The spelling of 990488432640 in words is "nine hundred ninety billion, four hundred eighty-eight million, four hundred thirty-two thousand, six hundred forty".