9718728 has 32 divisors (see below), whose sum is σ = 25576800. Its totient is φ = 3068928.

The previous prime is 9718727. The next prime is 9718733. The reversal of 9718728 is 8278179.

It is a self number, because there is not a number n which added to its sum of digits gives 9718728.

It is not an unprimeable number, because it can be changed into a prime (9718727) 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, 10201 + ... + 11112.

It is an arithmetic number, because the mean of its divisors is an integer number (799275).

Almost surely, 2^9718728 is an apocalyptic number.

It is an amenable number.

9718728 is an abundant number, since it is smaller than the sum of its proper divisors (15858072).

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

9718728 is a wasteful number, since it uses less digits than its factorization.

9718728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21341 (or 21337 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 9718728 is about 3117.4874498544. The cubic root of 9718728 is about 213.4042884635.

The spelling of 9718728 in words is "nine million, seven hundred eighteen thousand, seven hundred twenty-eight".