731280720 has 80 divisors (see below), whose sum is σ = 2272211712. Its totient is φ = 194557440.

The previous prime is 731280707. The next prime is 731280761. The reversal of 731280720 is 27082137.

731280720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107830 + ... + 114410.

Almost surely, 2^731280720 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 731280720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136105856).

731280720 is an abundant number, since it is smaller than the sum of its proper divisors (1540930992).

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

731280720 is a wasteful number, since it uses less digits than its factorization.

731280720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060 (or 7054 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 731280720 is about 27042.2025730154. The cubic root of 731280720 is about 900.9375908104.

The spelling of 731280720 in words is "seven hundred thirty-one million, two hundred eighty thousand, seven hundred twenty".