72161020780 has 24 divisors (see below), whose sum is σ = 151551289008. Its totient is φ = 28861904448.

The previous prime is 72161020703. The next prime is 72161020817. The reversal of 72161020780 is 8702016127.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89242 + ... + 390238.

It is an arithmetic number, because the mean of its divisors is an integer number (6314637042).

Almost surely, 2^72161020780 is an apocalyptic number.

It is an amenable number.

72161020780 is an abundant number, since it is smaller than the sum of its proper divisors (79390268228).

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

72161020780 is a wasteful number, since it uses less digits than its factorization.

72161020780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312993 (or 312991 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The spelling of 72161020780 in words is "seventy-two billion, one hundred sixty-one million, twenty thousand, seven hundred eighty".