9881664 has 112 divisors (see below), whose sum is σ = 29187648. Its totient is φ = 2930688.

The previous prime is 9881647. The next prime is 9881671. The reversal of 9881664 is 4661889.

Its product of digits (82944) is a multiple of the sum of its prime divisors (162).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92299 + ... + 92405.

It is an arithmetic number, because the mean of its divisors is an integer number (260604).

Almost surely, 2^9881664 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 9881664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14593824).

9881664 is an abundant number, since it is smaller than the sum of its proper divisors (19305984).

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

9881664 is a wasteful number, since it uses less digits than its factorization.

9881664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 162 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 9881664 is about 3143.5114124176. The cubic root of 9881664 is about 214.5902706862.

The spelling of 9881664 in words is "nine million, eight hundred eighty-one thousand, six hundred sixty-four".