720677 has 2 divisors, whose sum is σ = 720678. Its totient is φ = 720676.

The previous prime is 720661. The next prime is 720683. The reversal of 720677 is 776027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 58081 = 814^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 720677 - 2⁴ = 720661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360338 + 360339.

It is an arithmetic number, because the mean of its divisors is an integer number (360339).

2⁷²⁰⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

720677 is a deficient number, since it is larger than the sum of its proper divisors (1).

720677 is an equidigital number, since it uses as much as digits as its factorization.

720677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 720677 is about 848.9269697683. The cubic root of 720677 is about 89.6561778997.

The spelling of 720677 in words is "seven hundred twenty thousand, six hundred seventy-seven".