720564818 has 8 divisors (see below), whose sum is σ = 1098566220. Its totient is φ = 354376080.

The previous prime is 720564811. The next prime is 720564821. The reversal of 720564818 is 818465027.

It can be written as a sum of positive squares in 2 ways, for example, as 716472289 + 4092529 = 26767^2 + 2023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720564811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2953013 + ... + 2953256.

Almost surely, 2^720564818 is an apocalyptic number.

720564818 is a deficient number, since it is larger than the sum of its proper divisors (378001402).

720564818 is a wasteful number, since it uses less digits than its factorization.

720564818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5906332.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 720564818 is about 26843.3384287424. The cubic root of 720564818 is about 896.5152563927.

The spelling of 720564818 in words is "seven hundred twenty million, five hundred sixty-four thousand, eight hundred eighteen".