72727317172 has 12 divisors (see below), whose sum is σ = 127292272996. Its totient is φ = 36358096320.

The previous prime is 72727317121. The next prime is 72727317193. The reversal of 72727317172 is 27171372727.

It can be written as a sum of positive squares in 2 ways, for example, as 42814231056 + 29913086116 = 206916^2 + 172954^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1361079 + ... + 1413502.

Almost surely, 2^72727317172 is an apocalyptic number.

It is an amenable number.

72727317172 is a deficient number, since it is larger than the sum of its proper divisors (54564955824).

72727317172 is a wasteful number, since it uses less digits than its factorization.

72727317172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781138 (or 2781136 counting only the distinct ones).

The product of its digits is 403368, while the sum is 46.

Adding to 72727317172 its reverse (27171372727), we get a palindrome (99898689899).

The spelling of 72727317172 in words is "seventy-two billion, seven hundred twenty-seven million, three hundred seventeen thousand, one hundred seventy-two".