720689713 has 2 divisors, whose sum is σ = 720689714. Its totient is φ = 720689712.

The previous prime is 720689657. The next prime is 720689731. The reversal of 720689713 is 317986027.

It is a happy number.

Together with next prime (720689731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521117584 + 199572129 = 22828^2 + 14127^2 .

It is a cyclic number.

It is not a de Polignac number, because 720689713 - 2⁹ = 720689201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720689713.

It is not a weakly prime, because it can be changed into another prime (720680713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360344856 + 360344857.

It is an arithmetic number, because the mean of its divisors is an integer number (360344857).

Almost surely, 2^720689713 is an apocalyptic number.

It is an amenable number.

720689713 is a deficient number, since it is larger than the sum of its proper divisors (1).

720689713 is an equidigital number, since it uses as much as digits as its factorization.

720689713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 720689713 is about 26845.6646965576. The cubic root of 720689713 is about 896.5670508561.

The spelling of 720689713 in words is "seven hundred twenty million, six hundred eighty-nine thousand, seven hundred thirteen".