720563306 has 8 divisors (see below), whose sum is σ = 1084863780. Its totient is φ = 358942048.

The previous prime is 720563303. The next prime is 720563321. The reversal of 720563306 is 603365027.

It can be written as a sum of positive squares in 2 ways, for example, as 717757681 + 2805625 = 26791^2 + 1675^2 .

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

It is a super-2 number, since 2×720563306² = 1038422955907299272, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720563303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669131 + ... + 670206.

Almost surely, 2^720563306 is an apocalyptic number.

720563306 is a deficient number, since it is larger than the sum of its proper divisors (364300474).

720563306 is a wasteful number, since it uses less digits than its factorization.

720563306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339608.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 720563306 is about 26843.3102653156. The cubic root of 720563306 is about 896.5146293234.

The spelling of 720563306 in words is "seven hundred twenty million, five hundred sixty-three thousand, three hundred six".