729566621 has 8 divisors (see below), whose sum is σ = 836115840. Its totient is φ = 623598768.

The previous prime is 729566609. The next prime is 729566623. The reversal of 729566621 is 126665927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 729566621 - 2⁶ = 729566557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729566623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142646 + ... + 147671.

It is an arithmetic number, because the mean of its divisors is an integer number (104514480).

Almost surely, 2^729566621 is an apocalyptic number.

It is an amenable number.

729566621 is a deficient number, since it is larger than the sum of its proper divisors (106549219).

729566621 is a wasteful number, since it uses less digits than its factorization.

729566621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290683.

The product of its digits is 272160, while the sum is 44.

The square root of 729566621 is about 27010.4909433353. The cubic root of 729566621 is about 900.2331169793.

The spelling of 729566621 in words is "seven hundred twenty-nine million, five hundred sixty-six thousand, six hundred twenty-one".