9728161042 has 4 divisors (see below), whose sum is σ = 14592241566. Its totient is φ = 4864080520.

The previous prime is 9728161033. The next prime is 9728161043. The reversal of 9728161042 is 2401618279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2401618279 = 6563 ⋅365933.

It can be written as a sum of positive squares in only one way, i.e., 8796751681 + 931409361 = 93791^2 + 30519^2 .

It is a super-3 number, since 3×9728161042³ (a number of 31 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 9728160986 and 9728161004.

It is not an unprimeable number, because it can be changed into a prime (9728161043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2432040259 + ... + 2432040262.

Almost surely, 2^9728161042 is an apocalyptic number.

9728161042 is a deficient number, since it is larger than the sum of its proper divisors (4864080524).

9728161042 is a wasteful number, since it uses less digits than its factorization.

9728161042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4864080523.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 9728161042 is about 98631.4404335656. The cubic root of 9728161042 is about 2134.7330986477.

The spelling of 9728161042 in words is "nine billion, seven hundred twenty-eight million, one hundred sixty-one thousand, forty-two".