9072731808 has 432 divisors, whose sum is σ = 31950132480. Its totient is φ = 2497340160.

The previous prime is 9072731797. The next prime is 9072731813. The reversal of 9072731808 is 8081372709.

It is a tau number, because it is divible by the number of its divisors (432).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40684785 + ... + 40685007.

It is an arithmetic number, because the mean of its divisors is an integer number (73958640).

Almost surely, 2^9072731808 is an apocalyptic number.

9072731808 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9072731808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15975066240).

9072731808 is an abundant number, since it is smaller than the sum of its proper divisors (22877400672).

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

9072731808 is a wasteful number, since it uses less digits than its factorization.

9072731808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 9072731808 is about 95250.8887517592. Note that the first 3 decimals coincide. The cubic root of 9072731808 is about 2085.6720653205.

The spelling of 9072731808 in words is "nine billion, seventy-two million, seven hundred thirty-one thousand, eight hundred eight".