9801728 has 26 divisors (see below), whose sum is σ = 19609254. Its totient is φ = 4898816.

The previous prime is 9801713. The next prime is 9801769. The reversal of 9801728 is 8271089.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5607424 + 4194304 = 2368^2 + 2048^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2900 + ... + 5292.

Almost surely, 2^9801728 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 9801728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9804627).

9801728 is an abundant number, since it is smaller than the sum of its proper divisors (9807526).

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

9801728 is an equidigital number, since it uses as much as digits as its factorization.

9801728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417 (or 2395 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 9801728 is about 3130.7711510106. The cubic root of 9801728 is about 214.0100731858.

The spelling of 9801728 in words is "nine million, eight hundred one thousand, seven hundred twenty-eight".