696628729 has 2 divisors, whose sum is σ = 696628730. Its totient is φ = 696628728.

The previous prime is 696628727. The next prime is 696628747. The reversal of 696628729 is 927826696.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 558613225 + 138015504 = 23635^2 + 11748^2 .

It is a cyclic number.

It is not a de Polignac number, because 696628729 - 2¹ = 696628727 is a prime.

Together with 696628727, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 696628729.

It is not a weakly prime, because it can be changed into another prime (696628727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348314364 + 348314365.

It is an arithmetic number, because the mean of its divisors is an integer number (348314365).

Almost surely, 2^696628729 is an apocalyptic number.

It is an amenable number.

696628729 is a deficient number, since it is larger than the sum of its proper divisors (1).

696628729 is an equidigital number, since it uses as much as digits as its factorization.

696628729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 55.

The square root of 696628729 is about 26393.7251823232. The cubic root of 696628729 is about 886.4762953804.

The spelling of 696628729 in words is "six hundred ninety-six million, six hundred twenty-eight thousand, seven hundred twenty-nine".