720697 has 2 divisors, whose sum is σ = 720698. Its totient is φ = 720696.

The previous prime is 720683. The next prime is 720703. The reversal of 720697 is 796027.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674041 + 46656 = 821^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 720697 - 2⁷ = 720569 is a prime.

It is an Ulam number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360348 + 360349.

It is an arithmetic number, because the mean of its divisors is an integer number (360349).

2⁷²⁰⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

720697 is a deficient number, since it is larger than the sum of its proper divisors (1).

720697 is an equidigital number, since it uses as much as digits as its factorization.

720697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 720697 is about 848.9387492629. The cubic root of 720697 is about 89.6570072620.

The spelling of 720697 in words is "seven hundred twenty thousand, six hundred ninety-seven".