8991680 has 28 divisors (see below), whose sum is σ = 21412200. Its totient is φ = 3596544.

The previous prime is 8991679. The next prime is 8991713. The reversal of 8991680 is 861998.

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, 13730 + ... + 14369.

Almost surely, 2^8991680 is an apocalyptic number.

8991680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8991680 is an abundant number, since it is smaller than the sum of its proper divisors (12420520).

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

8991680 is a wasteful number, since it uses less digits than its factorization.

8991680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28116 (or 28106 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 8991680 is about 2998.6130127110. The cubic root of 8991680 is about 207.9442651457.

The spelling of 8991680 in words is "eight million, nine hundred ninety-one thousand, six hundred eighty".