72322720 has 24 divisors (see below), whose sum is σ = 170862804. Its totient is φ = 28929024.

The previous prime is 72322703. The next prime is 72322727. The reversal of 72322720 is 2722327.

It can be written as a sum of positive squares in 2 ways, for example, as 62663056 + 9659664 = 7916^2 + 3108^2 .

It is not an unprimeable number, because it can be changed into a prime (72322727) 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, 225849 + ... + 226168.

Almost surely, 2^72322720 is an apocalyptic number.

It is an amenable number.

72322720 is an abundant number, since it is smaller than the sum of its proper divisors (98540084).

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

72322720 is a wasteful number, since it uses less digits than its factorization.

72322720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452032 (or 452024 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 72322720 is about 8504.2765712317. The cubic root of 72322720 is about 416.6373981219.

The spelling of 72322720 in words is "seventy-two million, three hundred twenty-two thousand, seven hundred twenty".