720856069 has 2 divisors, whose sum is σ = 720856070. Its totient is φ = 720856068.

The previous prime is 720856039. The next prime is 720856139. The reversal of 720856069 is 960658027.

720856069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416772225 + 304083844 = 20415^2 + 17438^2 .

It is a cyclic number.

It is not a de Polignac number, because 720856069 - 2⁹ = 720855557 is a prime.

It is a super-2 number, since 2×720856069² = 1039266944428265522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720856039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360428034 + 360428035.

It is an arithmetic number, because the mean of its divisors is an integer number (360428035).

Almost surely, 2^720856069 is an apocalyptic number.

It is an amenable number.

720856069 is a deficient number, since it is larger than the sum of its proper divisors (1).

720856069 is an equidigital number, since it uses as much as digits as its factorization.

720856069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 720856069 is about 26848.7628951503. The cubic root of 720856069 is about 896.6360300719.

The spelling of 720856069 in words is "seven hundred twenty million, eight hundred fifty-six thousand, sixty-nine".