720732791 has 2 divisors, whose sum is σ = 720732792. Its totient is φ = 720732790.

The previous prime is 720732763. The next prime is 720732811. The reversal of 720732791 is 197237027.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720732791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720737791) 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, 360366395 + 360366396.

It is an arithmetic number, because the mean of its divisors is an integer number (360366396).

Almost surely, 2^720732791 is an apocalyptic number.

720732791 is a deficient number, since it is larger than the sum of its proper divisors (1).

720732791 is an equidigital number, since it uses as much as digits as its factorization.

720732791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 720732791 is about 26846.4670115082. The cubic root of 720732791 is about 896.5849140896.

The spelling of 720732791 in words is "seven hundred twenty million, seven hundred thirty-two thousand, seven hundred ninety-one".