72720179820 has 72 divisors (see below), whose sum is σ = 221337554256. Its totient is φ = 19325849472.

The previous prime is 72720179809. The next prime is 72720179867. The reversal of 72720179820 is 2897102727.

It is a Harshad number since it is a multiple of its sum of digits (45).

72720179820 is a modest number, since divided by 179820 gives 72720 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 636682 + ... + 742161.

It is an arithmetic number, because the mean of its divisors is an integer number (3074132698).

Almost surely, 2^72720179820 is an apocalyptic number.

It is an amenable number.

72720179820 is an abundant number, since it is smaller than the sum of its proper divisors (148617374436).

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

72720179820 is a wasteful number, since it uses less digits than its factorization.

72720179820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379151 (or 1379146 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The spelling of 72720179820 in words is "seventy-two billion, seven hundred twenty million, one hundred seventy-nine thousand, eight hundred twenty".