9971664 has 20 divisors (see below), whose sum is σ = 25760256. Its totient is φ = 3323872.

The previous prime is 9971653. The next prime is 9971681. The reversal of 9971664 is 4661799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103824 + ... + 103919.

Almost surely, 2^9971664 is an apocalyptic number.

It is an amenable number.

9971664 is an abundant number, since it is smaller than the sum of its proper divisors (15788592).

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

9971664 is a wasteful number, since it uses less digits than its factorization.

9971664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207754 (or 207748 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 9971664 is about 3157.7941668196. The cubic root of 9971664 is about 215.2397829557.

The spelling of 9971664 in words is "nine million, nine hundred seventy-one thousand, six hundred sixty-four".