720678869 has 2 divisors, whose sum is σ = 720678870. Its totient is φ = 720678868.

The previous prime is 720678851. The next prime is 720678887. The reversal of 720678869 is 968876027.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (720678851) and next prime (720678887).

It can be written as a sum of positive squares in only one way, i.e., 699867025 + 20811844 = 26455^2 + 4562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720678869 is a prime.

It is a super-2 number, since 2×720678869² = 1038756064446238322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 720678869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720678269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360339434 + 360339435.

It is an arithmetic number, because the mean of its divisors is an integer number (360339435).

Almost surely, 2^720678869 is an apocalyptic number.

It is an amenable number.

720678869 is a deficient number, since it is larger than the sum of its proper divisors (1).

720678869 is an equidigital number, since it uses as much as digits as its factorization.

720678869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The square root of 720678869 is about 26845.4627265018. The cubic root of 720678869 is about 896.5625540425.

The spelling of 720678869 in words is "seven hundred twenty million, six hundred seventy-eight thousand, eight hundred sixty-nine".