72880861321 has 4 divisors (see below), whose sum is σ = 75393994500. Its totient is φ = 70367728144.

The previous prime is 72880861289. The next prime is 72880861349. The reversal of 72880861321 is 12316808827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33659039296 + 39221822025 = 183464^2 + 198045^2 .

It is a cyclic number.

It is not a de Polignac number, because 72880861321 - 2⁵ = 72880861289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72880831321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256566546 + ... + 1256566603.

It is an arithmetic number, because the mean of its divisors is an integer number (18848498625).

Almost surely, 2^72880861321 is an apocalyptic number.

It is an amenable number.

72880861321 is a deficient number, since it is larger than the sum of its proper divisors (2513133179).

72880861321 is a wasteful number, since it uses less digits than its factorization.

72880861321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513133178.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 72880861321 in words is "seventy-two billion, eight hundred eighty million, eight hundred sixty-one thousand, three hundred twenty-one".