720678811 has 2 divisors, whose sum is σ = 720678812. Its totient is φ = 720678810.

The previous prime is 720678767. The next prime is 720678817. The reversal of 720678811 is 118876027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720678811 - 2¹⁷ = 720547739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720678817) 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, 360339405 + 360339406.

It is an arithmetic number, because the mean of its divisors is an integer number (360339406).

Almost surely, 2^720678811 is an apocalyptic number.

720678811 is a deficient number, since it is larger than the sum of its proper divisors (1).

720678811 is an equidigital number, since it uses as much as digits as its factorization.

720678811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 720678811 is about 26845.4616462448. The cubic root of 720678811 is about 896.5625299908.

The spelling of 720678811 in words is "seven hundred twenty million, six hundred seventy-eight thousand, eight hundred eleven".