72718487522 has 18 divisors (see below), whose sum is σ = 112728198987. Its totient is φ = 35180644500.

The previous prime is 72718487521. The next prime is 72718487549. The reversal of 72718487522 is 22578481727.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 36359243761 + 36359243761 = 190681^2 + 190681^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=190681.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72718487521) 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 8 ways as a sum of consecutive naturals, for example, 11819147 + ... + 11825297.

Almost surely, 2^72718487522 is an apocalyptic number.

72718487522 is a deficient number, since it is larger than the sum of its proper divisors (40009711465).

72718487522 is an frugal number, since it uses more digits than its factorization.

72718487522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12366 (or 6184 counting only the distinct ones).

The product of its digits is 3512320, while the sum is 53.

The spelling of 72718487522 in words is "seventy-two billion, seven hundred eighteen million, four hundred eighty-seven thousand, five hundred twenty-two".