720688399 has 2 divisors, whose sum is σ = 720688400. Its totient is φ = 720688398.

The previous prime is 720688379. The next prime is 720688427. The reversal of 720688399 is 993886027.

It is a weak prime.

It is an emirp because it is prime and its reverse (993886027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720688399 - 2¹⁹ = 720164111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720688379) 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, 360344199 + 360344200.

It is an arithmetic number, because the mean of its divisors is an integer number (360344200).

Almost surely, 2^720688399 is an apocalyptic number.

720688399 is a deficient number, since it is larger than the sum of its proper divisors (1).

720688399 is an equidigital number, since it uses as much as digits as its factorization.

720688399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 720688399 is about 26845.6402233212. The cubic root of 720688399 is about 896.5665059661.

The spelling of 720688399 in words is "seven hundred twenty million, six hundred eighty-eight thousand, three hundred ninety-nine".