72139913918 has 8 divisors (see below), whose sum is σ = 108557813520. Its totient is φ = 35953976080.

The previous prime is 72139913827. The next prime is 72139913971. The reversal of 72139913918 is 81931993127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×72139913918² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72139913918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57989663 + ... + 57990906.

It is an arithmetic number, because the mean of its divisors is an integer number (13569726690).

Almost surely, 2^72139913918 is an apocalyptic number.

72139913918 is a deficient number, since it is larger than the sum of its proper divisors (36417899602).

72139913918 is a wasteful number, since it uses less digits than its factorization.

72139913918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115980882.

The product of its digits is 734832, while the sum is 53.

The spelling of 72139913918 in words is "seventy-two billion, one hundred thirty-nine million, nine hundred thirteen thousand, nine hundred eighteen".