9664729 has 2 divisors, whose sum is σ = 9664730. Its totient is φ = 9664728.

The previous prime is 9664727. The next prime is 9664741. The reversal of 9664729 is 9274669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7414729 + 2250000 = 2723^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 9664729 - 2¹ = 9664727 is a prime.

Together with 9664727, it forms a pair of twin primes.

9664729 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9664727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4832364 + 4832365.

It is an arithmetic number, because the mean of its divisors is an integer number (4832365).

Almost surely, 2^9664729 is an apocalyptic number.

It is an amenable number.

9664729 is a deficient number, since it is larger than the sum of its proper divisors (1).

9664729 is an equidigital number, since it uses as much as digits as its factorization.

9664729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 9664729 is about 3108.8147259044. The cubic root of 9664729 is about 213.0083166612.

The spelling of 9664729 in words is "nine million, six hundred sixty-four thousand, seven hundred twenty-nine".