72720654912 has 42 divisors (see below), whose sum is σ = 208440628838. Its totient is φ = 24240218112.

The previous prime is 72720654889. The next prime is 72720654971. The reversal of 72720654912 is 21945602727.

72720654912 is a `hidden beast` number, since 72 + 7 + 20 + 6 + 549 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68233798656 + 4486856256 = 261216^2 + 66984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63124993 + ... + 63126144.

Almost surely, 2^72720654912 is an apocalyptic number.

72720654912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

72720654912 is an abundant number, since it is smaller than the sum of its proper divisors (135719973926).

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

72720654912 is a wasteful number, since it uses less digits than its factorization.

72720654912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126251155 (or 126251142 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 72720654912 in words is "seventy-two billion, seven hundred twenty million, six hundred fifty-four thousand, nine hundred twelve".