9988720 has 40 divisors (see below), whose sum is σ = 26542944. Its totient is φ = 3424512.

The previous prime is 9988711. The next prime is 9988721. The reversal of 9988720 is 278899.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8359 + ... + 9478.

Almost surely, 2^9988720 is an apocalyptic number.

It is an amenable number.

9988720 is an abundant number, since it is smaller than the sum of its proper divisors (16554224).

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

9988720 is a wasteful number, since it uses less digits than its factorization.

9988720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17857 (or 17851 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 9988720 is about 3160.4936323302. The cubic root of 9988720 is about 215.3624317812.

The spelling of 9988720 in words is "nine million, nine hundred eighty-eight thousand, seven hundred twenty".