731072320 has 168 divisors, whose sum is σ = 1945843200. Its totient is φ = 261381120.

The previous prime is 731072317. The next prime is 731072347. The reversal of 731072320 is 23270137.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3058761 + ... + 3058999.

It is an arithmetic number, because the mean of its divisors is an integer number (11582400).

Almost surely, 2^731072320 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 731072320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972921600).

731072320 is an abundant number, since it is smaller than the sum of its proper divisors (1214770880).

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

731072320 is a wasteful number, since it uses less digits than its factorization.

731072320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 731072320 is about 27038.3490620267. The cubic root of 731072320 is about 900.8519997703.

The spelling of 731072320 in words is "seven hundred thirty-one million, seventy-two thousand, three hundred twenty".