9728655618 has 32 divisors (see below), whose sum is σ = 21306903552. Its totient is φ = 2936862800.

The previous prime is 9728655617. The next prime is 9728655721. The reversal of 9728655618 is 8165568279.

It is not an unprimeable number, because it can be changed into a prime (9728655611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262878 + ... + 297593.

It is an arithmetic number, because the mean of its divisors is an integer number (665840736).

Almost surely, 2^9728655618 is an apocalyptic number.

9728655618 is an abundant number, since it is smaller than the sum of its proper divisors (11578247934).

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

9728655618 is a wasteful number, since it uses less digits than its factorization.

9728655618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560750.

The product of its digits is 7257600, while the sum is 57.

The square root of 9728655618 is about 98633.9475941220. The cubic root of 9728655618 is about 2134.7692743737.

The spelling of 9728655618 in words is "nine billion, seven hundred twenty-eight million, six hundred fifty-five thousand, six hundred eighteen".