9128720 has 40 divisors (see below), whose sum is σ = 21634776. Its totient is φ = 3580928.

The previous prime is 9128719. The next prime is 9128737. The reversal of 9128720 is 278219.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 295936 + 8832784 = 544^2 + 2972^2 .

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

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, 3164 + ... + 5316.

Almost surely, 2^9128720 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 9128720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10817388).

9128720 is an abundant number, since it is smaller than the sum of its proper divisors (12506056).

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

9128720 is a wasteful number, since it uses less digits than its factorization.

9128720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219 (or 2213 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 9128720 is about 3021.3771694378. The cubic root of 9128720 is about 208.9953525672.

The spelling of 9128720 in words is "nine million, one hundred twenty-eight thousand, seven hundred twenty".