990844749408 has 192 divisors, whose sum is σ = 2771250693120. Its totient is φ = 309332779008.

The previous prime is 990844749383. The next prime is 990844749529. The reversal of 990844749408 is 804947448099.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20216260 + ... + 20265212.

It is an arithmetic number, because the mean of its divisors is an integer number (14433597360).

Almost surely, 2^990844749408 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 990844749408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385625346560).

990844749408 is an abundant number, since it is smaller than the sum of its proper divisors (1780405943712).

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

990844749408 is a wasteful number, since it uses less digits than its factorization.

990844749408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49181 (or 49173 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 66.

The spelling of 990844749408 in words is "nine hundred ninety billion, eight hundred forty-four million, seven hundred forty-nine thousand, four hundred eight".