8721748687 has 16 divisors (see below), whose sum is σ = 9040204800. Its totient is φ = 8409731040.

The previous prime is 8721748681. The next prime is 8721748703. The reversal of 8721748687 is 7868471278.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8721748687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721748681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912262 + ... + 921772.

It is an arithmetic number, because the mean of its divisors is an integer number (565012800).

Almost surely, 2^8721748687 is an apocalyptic number.

8721748687 is a deficient number, since it is larger than the sum of its proper divisors (318456113).

8721748687 is a wasteful number, since it uses less digits than its factorization.

8721748687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9846.

The product of its digits is 8429568, while the sum is 58.

The square root of 8721748687 is about 93390.3029602110. The cubic root of 8721748687 is about 2058.4225117185.

The spelling of 8721748687 in words is "eight billion, seven hundred twenty-one million, seven hundred forty-eight thousand, six hundred eighty-seven".