720723840 has 256 divisors, whose sum is σ = 2474634240. Its totient is φ = 177766400.

The previous prime is 720723833. The next prime is 720723841. The reversal of 720723840 is 48327027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720723841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2317285 + ... + 2317595.

It is an arithmetic number, because the mean of its divisors is an integer number (9666540).

Almost surely, 2^720723840 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 720723840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237317120).

720723840 is an abundant number, since it is smaller than the sum of its proper divisors (1753910400).

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

720723840 is a wasteful number, since it uses less digits than its factorization.

720723840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 720723840 is about 26846.3003037663. The cubic root of 720723840 is about 896.5812024205.

The spelling of 720723840 in words is "seven hundred twenty million, seven hundred twenty-three thousand, eight hundred forty".