9728918881 has 8 divisors (see below), whose sum is σ = 10653724224. Its totient is φ = 8810839920.

The previous prime is 9728918863. The next prime is 9728918909. The reversal of 9728918881 is 1888198279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9728918881 - 2⁹ = 9728918369 is a prime.

It is a super-2 number, since 2×9728918881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9728918581) 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, 1678566 + ... + 1684351.

It is an arithmetic number, because the mean of its divisors is an integer number (1331715528).

Almost surely, 2^9728918881 is an apocalyptic number.

It is an amenable number.

9728918881 is a deficient number, since it is larger than the sum of its proper divisors (924805343).

9728918881 is a wasteful number, since it uses less digits than its factorization.

9728918881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363191.

The product of its digits is 4644864, while the sum is 61.

The square root of 9728918881 is about 98635.2821306859. The cubic root of 9728918881 is about 2134.7885302270.

The spelling of 9728918881 in words is "nine billion, seven hundred twenty-eight million, nine hundred eighteen thousand, eight hundred eighty-one".