720865040 has 80 divisors (see below), whose sum is σ = 1921722240. Its totient is φ = 246343680.

The previous prime is 720865007. The next prime is 720865049. The reversal of 720865040 is 40568027.

720865040 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 junction number, because it is equal to n+sod(n) for n = 720864988 and 720865006.

It is not an unprimeable number, because it can be changed into a prime (720865049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183416 + ... + 187304.

It is an arithmetic number, because the mean of its divisors is an integer number (24021528).

Almost surely, 2^720865040 is an apocalyptic number.

720865040 is a gapful number since it is divisible by the number (70) 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 720865040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960861120).

720865040 is an abundant number, since it is smaller than the sum of its proper divisors (1200857200).

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

720865040 is a wasteful number, since it uses less digits than its factorization.

720865040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240 (or 4234 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 720865040 is about 26848.9299600561. The cubic root of 720865040 is about 896.6397495793.

The spelling of 720865040 in words is "seven hundred twenty million, eight hundred sixty-five thousand, forty".