8999720 has 16 divisors (see below), whose sum is σ = 20249460. Its totient is φ = 3599872.

The previous prime is 8999707. The next prime is 8999737. The reversal of 8999720 is 279998.

It can be written as a sum of positive squares in 2 ways, for example, as 8561476 + 438244 = 2926^2 + 662^2 .

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, 112457 + ... + 112536.

Almost surely, 2^8999720 is an apocalyptic number.

It is an amenable number.

8999720 is an abundant number, since it is smaller than the sum of its proper divisors (11249740).

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

8999720 is a wasteful number, since it uses less digits than its factorization.

8999720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225004 (or 225000 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 8999720 is about 2999.9533329704. The cubic root of 8999720 is about 208.0062251589.

The spelling of 8999720 in words is "eight million, nine hundred ninety-nine thousand, seven hundred twenty".