872296307721 has 12 divisors (see below), whose sum is σ = 1334100235572. Its totient is φ = 547323173376.

The previous prime is 872296307699. The next prime is 872296307747. The reversal of 872296307721 is 127703692278.

It can be written as a sum of positive squares in 2 ways, for example, as 496602090000 + 375694217721 = 704700^2 + 612939^2 .

It is not a de Polignac number, because 872296307721 - 2⁵ = 872296307689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (872296307761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2850641376 + ... + 2850641681.

It is an arithmetic number, because the mean of its divisors is an integer number (111175019631).

Almost surely, 2^872296307721 is an apocalyptic number.

It is an amenable number.

872296307721 is a deficient number, since it is larger than the sum of its proper divisors (461803927851).

872296307721 is a wasteful number, since it uses less digits than its factorization.

872296307721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701283080 (or 5701283077 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

Adding to 872296307721 its reverse (127703692278), we get a palindrome (999999999999).

The spelling of 872296307721 in words is "eight hundred seventy-two billion, two hundred ninety-six million, three hundred seven thousand, seven hundred twenty-one".