72720454016 has 32 divisors (see below), whose sum is σ = 165568892880. Its totient is φ = 31165908480.

The previous prime is 72720454013. The next prime is 72720454057. The reversal of 72720454016 is 61045402727.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72720454013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40579715 + ... + 40581506.

Almost surely, 2^72720454016 is an apocalyptic number.

It is an amenable number.

72720454016 is an abundant number, since it is smaller than the sum of its proper divisors (92848438864).

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

72720454016 is an equidigital number, since it uses as much as digits as its factorization.

72720454016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81161242 (or 81161230 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 38.

The spelling of 72720454016 in words is "seventy-two billion, seven hundred twenty million, four hundred fifty-four thousand, sixteen".