9997728 has 48 divisors (see below), whose sum is σ = 28266336. Its totient is φ = 3075840.

The previous prime is 9997711. The next prime is 9997739. The reversal of 9997728 is 8277999.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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, 2758 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (588882).

Almost surely, 2^9997728 is an apocalyptic number.

It is an amenable number.

9997728 is an abundant number, since it is smaller than the sum of its proper divisors (18268608).

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

9997728 is a wasteful number, since it uses less digits than its factorization.

9997728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8037 (or 8029 counting only the distinct ones).

The product of its digits is 571536, while the sum is 51.

The square root of 9997728 is about 3161.9184050193. The cubic root of 9997728 is about 215.4271515153.

The spelling of 9997728 in words is "nine million, nine hundred ninety-seven thousand, seven hundred twenty-eight".