9072721224 has 480 divisors, whose sum is σ = 31284792000. Its totient is φ = 2445666048.

The previous prime is 9072721193. The next prime is 9072721247. The reversal of 9072721224 is 4221272709.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 54327589 + ... + 54327755.

It is an arithmetic number, because the mean of its divisors is an integer number (65176650).

Almost surely, 2^9072721224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9072721224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15642396000).

9072721224 is an abundant number, since it is smaller than the sum of its proper divisors (22212070776).

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

9072721224 is a wasteful number, since it uses less digits than its factorization.

9072721224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 9072721224 is about 95250.8331932062. The cubic root of 9072721224 is about 2085.6712542910.

The spelling of 9072721224 in words is "nine billion, seventy-two million, seven hundred twenty-one thousand, two hundred twenty-four".