720257 has 2 divisors, whose sum is σ = 720258. Its totient is φ = 720256.

The previous prime is 720253. The next prime is 720281. The reversal of 720257 is 752027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 712336 + 7921 = 844^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 720257 - 2² = 720253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360128 + 360129.

It is an arithmetic number, because the mean of its divisors is an integer number (360129).

2⁷²⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

720257 is a deficient number, since it is larger than the sum of its proper divisors (1).

720257 is an equidigital number, since it uses as much as digits as its factorization.

720257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 720257 is about 848.6795626148. The cubic root of 720257 is about 89.6387577461.

The spelling of 720257 in words is "seven hundred twenty thousand, two hundred fifty-seven".