720347668 has 6 divisors (see below), whose sum is σ = 1260608426. Its totient is φ = 360173832.

The previous prime is 720347657. The next prime is 720347669. The reversal of 720347668 is 866743027.

It is a happy number.

720347668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 508412304 + 211935364 = 22548^2 + 14558^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720347669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90043455 + ... + 90043462.

Almost surely, 2^720347668 is an apocalyptic number.

It is an amenable number.

720347668 is a deficient number, since it is larger than the sum of its proper divisors (540260758).

720347668 is a wasteful number, since it uses less digits than its factorization.

720347668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180086921 (or 180086919 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 720347668 is about 26839.2933588051. The cubic root of 720347668 is about 896.4251891554.

The spelling of 720347668 in words is "seven hundred twenty million, three hundred forty-seven thousand, six hundred sixty-eight".