720660 has 24 divisors (see below), whose sum is σ = 2018016. Its totient is φ = 192160.

The previous prime is 720653. The next prime is 720661. The reversal of 720660 is 66027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720661) by changing a digit.

720660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5946 + ... + 6065.

It is an arithmetic number, because the mean of its divisors is an integer number (84084).

2⁷²⁰⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

720660 is an abundant number, since it is smaller than the sum of its proper divisors (1297356).

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

720660 is a wasteful number, since it uses less digits than its factorization.

720660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12023 (or 12021 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 720660 is about 848.9169570694. The cubic root of 720660 is about 89.6554729297.

Adding to 720660 its reverse (66027), we get a palindrome (786687).

The spelling of 720660 in words is "seven hundred twenty thousand, six hundred sixty".