720861629 has 2 divisors, whose sum is σ = 720861630. Its totient is φ = 720861628.

The previous prime is 720861601. The next prime is 720861677. The reversal of 720861629 is 926168027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549199225 + 171662404 = 23435^2 + 13102^2 .

It is a cyclic number.

It is not a de Polignac number, because 720861629 - 2⁸ = 720861373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_37276439 and since 720861629 and 37276439 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720861689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360430814 + 360430815.

It is an arithmetic number, because the mean of its divisors is an integer number (360430815).

Almost surely, 2^720861629 is an apocalyptic number.

It is an amenable number.

720861629 is a deficient number, since it is larger than the sum of its proper divisors (1).

720861629 is an equidigital number, since it uses as much as digits as its factorization.

720861629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 720861629 is about 26848.8664378964. The cubic root of 720861629 is about 896.6383353326.

The spelling of 720861629 in words is "seven hundred twenty million, eight hundred sixty-one thousand, six hundred twenty-nine".