72686945856 has 56 divisors (see below), whose sum is σ = 219791483200. Its totient is φ = 20767698432.

The previous prime is 72686945801. The next prime is 72686945869. The reversal of 72686945856 is 65854968627.

It is a tau number, because it is divible by the number of its divisors (56).

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, 27039931 + ... + 27042618.

Almost surely, 2^72686945856 is an apocalyptic number.

It is an amenable number.

72686945856 is an abundant number, since it is smaller than the sum of its proper divisors (147104537344).

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

72686945856 is a wasteful number, since it uses less digits than its factorization.

72686945856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54082571 (or 54082561 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 66.

The spelling of 72686945856 in words is "seventy-two billion, six hundred eighty-six million, nine hundred forty-five thousand, eight hundred fifty-six".