720083809 has 2 divisors, whose sum is σ = 720083810. Its totient is φ = 720083808.

The previous prime is 720083803. The next prime is 720083821. The reversal of 720083809 is 908380027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 719741584 + 342225 = 26828^2 + 585^2 .

It is an emirp because it is prime and its reverse (908380027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720083809 - 2¹³ = 720075617 is a prime.

It is not a weakly prime, because it can be changed into another prime (720083803) 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, 360041904 + 360041905.

It is an arithmetic number, because the mean of its divisors is an integer number (360041905).

Almost surely, 2^720083809 is an apocalyptic number.

It is an amenable number.

720083809 is a deficient number, since it is larger than the sum of its proper divisors (1).

720083809 is an equidigital number, since it uses as much as digits as its factorization.

720083809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 720083809 is about 26834.3773730638. The cubic root of 720083809 is about 896.3157240780.

The spelling of 720083809 in words is "seven hundred twenty million, eighty-three thousand, eight hundred nine".