720567643 has 2 divisors, whose sum is σ = 720567644. Its totient is φ = 720567642.

The previous prime is 720567619. The next prime is 720567677. The reversal of 720567643 is 346765027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720567643 - 2¹⁷ = 720436571 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 720567596 and 720567605.

It is not a weakly prime, because it can be changed into another prime (720547643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360283821 + 360283822.

It is an arithmetic number, because the mean of its divisors is an integer number (360283822).

Almost surely, 2^720567643 is an apocalyptic number.

720567643 is a deficient number, since it is larger than the sum of its proper divisors (1).

720567643 is an equidigital number, since it uses as much as digits as its factorization.

720567643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 40.

The square root of 720567643 is about 26843.3910488224. The cubic root of 720567643 is about 896.5164279978.

The spelling of 720567643 in words is "seven hundred twenty million, five hundred sixty-seven thousand, six hundred forty-three".