9871663984 has 80 divisors (see below), whose sum is σ = 23560492032. Its totient is φ = 3901895424.

The previous prime is 9871663981. The next prime is 9871663999. The reversal of 9871663984 is 4893661789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871663981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2302707 + ... + 2306989.

Almost surely, 2^9871663984 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 9871663984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11780246016).

9871663984 is an abundant number, since it is smaller than the sum of its proper divisors (13688828048).

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

9871663984 is a wasteful number, since it uses less digits than its factorization.

9871663984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5894 (or 5888 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The square root of 9871663984 is about 99356.2478357552. The cubic root of 9871663984 is about 2145.1785945337.

The spelling of 9871663984 in words is "nine billion, eight hundred seventy-one million, six hundred sixty-three thousand, nine hundred eighty-four".