8021732861 has 16 divisors (see below), whose sum is σ = 8436445248. Its totient is φ = 7618665600.

The previous prime is 8021732827. The next prime is 8021732879. The reversal of 8021732861 is 1682371208.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8021732861 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021735861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533831 + ... + 548651.

It is an arithmetic number, because the mean of its divisors is an integer number (527277828).

Almost surely, 2^8021732861 is an apocalyptic number.

It is an amenable number.

8021732861 is a deficient number, since it is larger than the sum of its proper divisors (414712387).

8021732861 is a wasteful number, since it uses less digits than its factorization.

8021732861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15212.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 8021732861 is about 89564.1270878023. The cubic root of 8021732861 is about 2001.8094342302.

The spelling of 8021732861 in words is "eight billion, twenty-one million, seven hundred thirty-two thousand, eight hundred sixty-one".