72717817138 has 16 divisors (see below), whose sum is σ = 109299611520. Its totient is φ = 36284646736.

The previous prime is 72717817103. The next prime is 72717817141. The reversal of 72717817138 is 83171871727.

It is a super-3 number, since 3×72717817138³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8817645 + ... + 8825887.

It is an arithmetic number, because the mean of its divisors is an integer number (6831225720).

Almost surely, 2^72717817138 is an apocalyptic number.

72717817138 is a deficient number, since it is larger than the sum of its proper divisors (36581794382).

72717817138 is a wasteful number, since it uses less digits than its factorization.

72717817138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16721.

The product of its digits is 921984, while the sum is 52.

The spelling of 72717817138 in words is "seventy-two billion, seven hundred seventeen million, eight hundred seventeen thousand, one hundred thirty-eight".