990215884386 has 96 divisors (see below), whose sum is σ = 2295448147200. Its totient is φ = 307581896160.

The previous prime is 990215884303. The next prime is 990215884391. The reversal of 990215884386 is 683488512099.

990215884386 is a `hidden beast` number, since 9 + 9 + 0 + 2 + 1 + 588 + 43 + 8 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15802305 + ... + 15864843.

It is an arithmetic number, because the mean of its divisors is an integer number (23910918200).

Almost surely, 2^990215884386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990215884386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1147724073600).

990215884386 is an abundant number, since it is smaller than the sum of its proper divisors (1305232262814).

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

990215884386 is a wasteful number, since it uses less digits than its factorization.

990215884386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63324 (or 63321 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 990215884386 in words is "nine hundred ninety billion, two hundred fifteen million, eight hundred eighty-four thousand, three hundred eighty-six".