720780 has 48 divisors (see below), whose sum is σ = 2074464. Its totient is φ = 186880.

The previous prime is 720779. The next prime is 720791. The reversal of 720780 is 87027.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 720780.

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 15 ways as a sum of consecutive naturals, for example, 2314 + ... + 2606.

It is an arithmetic number, because the mean of its divisors is an integer number (43218).

2⁷²⁰⁷⁸⁰ 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 720780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1037232).

720780 is an abundant number, since it is smaller than the sum of its proper divisors (1353684).

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

720780 is a wasteful number, since it uses less digits than its factorization.

720780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 720780 is about 848.9876324188. The cubic root of 720780 is about 89.6604489515.

The spelling of 720780 in words is "seven hundred twenty thousand, seven hundred eighty".