720431867 has 2 divisors, whose sum is σ = 720431868. Its totient is φ = 720431866.

The previous prime is 720431863. The next prime is 720431879. The reversal of 720431867 is 768134027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720431867 - 2² = 720431863 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720431867.

It is not a weakly prime, because it can be changed into another prime (720431863) 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, 360215933 + 360215934.

It is an arithmetic number, because the mean of its divisors is an integer number (360215934).

Almost surely, 2^720431867 is an apocalyptic number.

720431867 is a deficient number, since it is larger than the sum of its proper divisors (1).

720431867 is an equidigital number, since it uses as much as digits as its factorization.

720431867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 720431867 is about 26840.8618900362. The cubic root of 720431867 is about 896.4601144964.

The spelling of 720431867 in words is "seven hundred twenty million, four hundred thirty-one thousand, eight hundred sixty-seven".