729644023 has 4 divisors (see below), whose sum is σ = 768046360. Its totient is φ = 691241688.

The previous prime is 729644017. The next prime is 729644039. The reversal of 729644023 is 320446927.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729644023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729644093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19201140 + ... + 19201177.

It is an arithmetic number, because the mean of its divisors is an integer number (192011590).

Almost surely, 2^729644023 is an apocalyptic number.

729644023 is a deficient number, since it is larger than the sum of its proper divisors (38402337).

729644023 is a wasteful number, since it uses less digits than its factorization.

729644023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38402336.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 729644023 is about 27011.9237189801. The cubic root of 729644023 is about 900.2649520340.

The spelling of 729644023 in words is "seven hundred twenty-nine million, six hundred forty-four thousand, twenty-three".