72720324 has 36 divisors (see below), whose sum is σ = 184644460. Its totient is φ = 24131520.

The previous prime is 72720311. The next prime is 72720409. The reversal of 72720324 is 42302727.

It can be written as a sum of positive squares in 2 ways, for example, as 58522500 + 14197824 = 7650^2 + 3768^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3834 + ... + 12654.

Almost surely, 2^72720324 is an apocalyptic number.

It is an amenable number.

72720324 is an abundant number, since it is smaller than the sum of its proper divisors (111924136).

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

72720324 is a wasteful number, since it uses less digits than its factorization.

72720324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060 (or 9055 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 72720324 is about 8527.6212392437. The cubic root of 72720324 is about 417.3995101591.

The spelling of 72720324 in words is "seventy-two million, seven hundred twenty thousand, three hundred twenty-four".