8891728513 has 4 divisors (see below), whose sum is σ = 8892177840. Its totient is φ = 8891279188.

The previous prime is 8891728459. The next prime is 8891728529. The reversal of 8891728513 is 3158271988.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8891728513 - 2²⁹ = 8354857601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8891728553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193543 + ... + 235036.

It is an arithmetic number, because the mean of its divisors is an integer number (2223044460).

Almost surely, 2^8891728513 is an apocalyptic number.

It is an amenable number.

8891728513 is a deficient number, since it is larger than the sum of its proper divisors (449327).

8891728513 is a wasteful number, since it uses less digits than its factorization.

8891728513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449326.

The product of its digits is 967680, while the sum is 52.

The square root of 8891728513 is about 94295.9623366770. The cubic root of 8891728513 is about 2071.7088981262.

The spelling of 8891728513 in words is "eight billion, eight hundred ninety-one million, seven hundred twenty-eight thousand, five hundred thirteen".