8991320 has 32 divisors (see below), whose sum is σ = 21787920. Its totient is φ = 3319680.

The previous prime is 8991319. The next prime is 8991347. The reversal of 8991320 is 231998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8126 + ... + 9165.

Almost surely, 2^8991320 is an apocalyptic number.

It is an amenable number.

8991320 is an abundant number, since it is smaller than the sum of its proper divisors (12796600).

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

8991320 is a wasteful number, since it uses less digits than its factorization.

8991320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17315 (or 17311 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 8991320 is about 2998.5529843576. The cubic root of 8991320 is about 207.9414899530.

The spelling of 8991320 in words is "eight million, nine hundred ninety-one thousand, three hundred twenty".