729581 has 12 divisors (see below), whose sum is σ = 804672. Its totient is φ = 660744.

The previous prime is 729577. The next prime is 729587. The reversal of 729581 is 185927.

It is not a de Polignac number, because 729581 - 2² = 729577 is a prime.

It is a super-2 number, since 2×729581² = 1064576871122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15500 + ... + 15546.

It is an arithmetic number, because the mean of its divisors is an integer number (67056).

2⁷²⁹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

729581 is a deficient number, since it is larger than the sum of its proper divisors (75091).

729581 is a wasteful number, since it uses less digits than its factorization.

729581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 109 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 729581 is about 854.1551381336. The cubic root of 729581 is about 90.0239031160.

The spelling of 729581 in words is "seven hundred twenty-nine thousand, five hundred eighty-one".