720561800 has 96 divisors (see below), whose sum is σ = 1936483200. Its totient is φ = 244231680.

The previous prime is 720561797. The next prime is 720561823. The reversal of 720561800 is 8165027.

720561800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121709 + ... + 127491.

It is an arithmetic number, because the mean of its divisors is an integer number (20171700).

Almost surely, 2^720561800 is an apocalyptic number.

720561800 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 720561800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968241600).

720561800 is an abundant number, since it is smaller than the sum of its proper divisors (1215921400).

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

720561800 is a wasteful number, since it uses less digits than its factorization.

720561800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5895 (or 5886 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 720561800 is about 26843.2822136191. The cubic root of 720561800 is about 896.5140047417.

The spelling of 720561800 in words is "seven hundred twenty million, five hundred sixty-one thousand, eight hundred".