720556729 has 2 divisors, whose sum is σ = 720556730. Its totient is φ = 720556728.

The previous prime is 720556721. The next prime is 720556763. The reversal of 720556729 is 927655027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623001600 + 97555129 = 24960^2 + 9877^2 .

It is a cyclic number.

It is not a de Polignac number, because 720556729 - 2³ = 720556721 is a prime.

It is not a weakly prime, because it can be changed into another prime (720556721) 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 as a sum of consecutive naturals, namely, 360278364 + 360278365.

It is an arithmetic number, because the mean of its divisors is an integer number (360278365).

Almost surely, 2^720556729 is an apocalyptic number.

It is an amenable number.

720556729 is a deficient number, since it is larger than the sum of its proper divisors (1).

720556729 is an equidigital number, since it uses as much as digits as its factorization.

720556729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 720556729 is about 26843.1877577906. The cubic root of 720556729 is about 896.5119016452.

The spelling of 720556729 in words is "seven hundred twenty million, five hundred fifty-six thousand, seven hundred twenty-nine".