9998720 has 64 divisors (see below), whose sum is σ = 25336800. Its totient is φ = 3760128.

The previous prime is 9998719. The next prime is 9998741. The reversal of 9998720 is 278999.

It is a tau number, because it is divible by the number of its divisors (64).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10421 + ... + 11339.

Almost surely, 2^9998720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12668400).

9998720 is an abundant number, since it is smaller than the sum of its proper divisors (15338080).

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

9998720 is a wasteful number, since it uses less digits than its factorization.

9998720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955 (or 943 counting only the distinct ones).

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

The square root of 9998720 is about 3162.0752679214. The cubic root of 9998720 is about 215.4342763563.

The spelling of 9998720 in words is "nine million, nine hundred ninety-eight thousand, seven hundred twenty".