8191664 has 20 divisors (see below), whose sum is σ = 17092656. Its totient is φ = 3780672.

The previous prime is 8191643. The next prime is 8191691. The reversal of 8191664 is 4661918.

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, 19484 + ... + 19899.

Almost surely, 2^8191664 is an apocalyptic number.

It is an amenable number.

8191664 is an abundant number, since it is smaller than the sum of its proper divisors (8900992).

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

8191664 is a wasteful number, since it uses less digits than its factorization.

8191664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39404 (or 39398 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 8191664 is about 2862.1083138134. The cubic root of 8191664 is about 201.5846118682.

The spelling of 8191664 in words is "eight million, one hundred ninety-one thousand, six hundred sixty-four".