72394566660 has 144 divisors (see below), whose sum is σ = 240951385584. Its totient is φ = 17483940864.

The previous prime is 72394566659. The next prime is 72394566709. The reversal of 72394566660 is 6666549327.

It can be written as a sum of positive squares in 8 ways, for example, as 2359296 + 72392207364 = 1536^2 + 269058^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72394566597 and 72394566606.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 167847 + ... + 415886.

It is an arithmetic number, because the mean of its divisors is an integer number (1673273511).

Almost surely, 2^72394566660 is an apocalyptic number.

It is an amenable number.

72394566660 is an abundant number, since it is smaller than the sum of its proper divisors (168556818924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72394566660 is a wasteful number, since it uses less digits than its factorization.

72394566660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583814 (or 583809 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

The spelling of 72394566660 in words is "seventy-two billion, three hundred ninety-four million, five hundred sixty-six thousand, six hundred sixty".