720605629 has 2 divisors, whose sum is σ = 720605630. Its totient is φ = 720605628.

The previous prime is 720605603. The next prime is 720605687. The reversal of 720605629 is 926506027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594043129 + 126562500 = 24373^2 + 11250^2 .

It is a cyclic number.

It is not a de Polignac number, because 720605629 - 2⁵ = 720605597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720605429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360302814 + 360302815.

It is an arithmetic number, because the mean of its divisors is an integer number (360302815).

Almost surely, 2^720605629 is an apocalyptic number.

It is an amenable number.

720605629 is a deficient number, since it is larger than the sum of its proper divisors (1).

720605629 is an equidigital number, since it uses as much as digits as its factorization.

720605629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 720605629 is about 26844.0985879578. The cubic root of 720605629 is about 896.5321815383.

The spelling of 720605629 in words is "seven hundred twenty million, six hundred five thousand, six hundred twenty-nine".