9728130018 has 16 divisors (see below), whose sum is σ = 19467193536. Its totient is φ = 3240887760.

The previous prime is 9728129989. The next prime is 9728130043. The reversal of 9728130018 is 8100318279.

It is a super-2 number, since 2×9728130018² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

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, 443973 + ... + 465368.

It is an arithmetic number, because the mean of its divisors is an integer number (1216699596).

Almost surely, 2^9728130018 is an apocalyptic number.

9728130018 is an abundant number, since it is smaller than the sum of its proper divisors (9739063518).

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

9728130018 is a wasteful number, since it uses less digits than its factorization.

9728130018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911129.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 9728130018 is about 98631.2831610742. The cubic root of 9728130018 is about 2134.7308293586.

The spelling of 9728130018 in words is "nine billion, seven hundred twenty-eight million, one hundred thirty thousand, eighteen".