9728840 has 32 divisors (see below), whose sum is σ = 23880960. Its totient is φ = 3537600.

The previous prime is 9728837. The next prime is 9728843. The reversal of 9728840 is 488279.

It is an interprime number because it is at equal distance from previous prime (9728837) and next prime (9728843).

It is a junction number, because it is equal to n+sod(n) for n = 9728794 and 9728803.

It is not an unprimeable number, because it can be changed into a prime (9728843) 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, 10616 + ... + 11495.

It is an arithmetic number, because the mean of its divisors is an integer number (746280).

Almost surely, 2^9728840 is an apocalyptic number.

It is an amenable number.

9728840 is an abundant number, since it is smaller than the sum of its proper divisors (14152120).

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

9728840 is a wasteful number, since it uses less digits than its factorization.

9728840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22133 (or 22129 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 9728840 is about 3119.1088470908. The cubic root of 9728840 is about 213.4782760668.

The spelling of 9728840 in words is "nine million, seven hundred twenty-eight thousand, eight hundred forty".