729047321 has 4 divisors (see below), whose sum is σ = 731952144. Its totient is φ = 726142500.

The previous prime is 729047303. The next prime is 729047381. The reversal of 729047321 is 123740927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729047321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (729047381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1452035 + ... + 1452536.

It is an arithmetic number, because the mean of its divisors is an integer number (182988036).

Almost surely, 2^729047321 is an apocalyptic number.

It is an amenable number.

729047321 is a deficient number, since it is larger than the sum of its proper divisors (2904823).

729047321 is a wasteful number, since it uses less digits than its factorization.

729047321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904822.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 729047321 is about 27000.8763005944. The cubic root of 729047321 is about 900.0194732412.

The spelling of 729047321 in words is "seven hundred twenty-nine million, forty-seven thousand, three hundred twenty-one".