729561 has 16 divisors (see below), whose sum is σ = 1136000. Its totient is φ = 416304.

The previous prime is 729559. The next prime is 729569. The reversal of 729561 is 165927.

729561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 729561 - 2¹ = 729559 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (729569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (71000).

2⁷²⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

729561 is a deficient number, since it is larger than the sum of its proper divisors (406439).

729561 is an equidigital number, since it uses as much as digits as its factorization.

729561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 719 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 729561 is about 854.1434305783. The cubic root of 729561 is about 90.0230805003.

The spelling of 729561 in words is "seven hundred twenty-nine thousand, five hundred sixty-one".