729081 has 10 divisors (see below), whose sum is σ = 1089242. Its totient is φ = 486000.

The previous prime is 729073. The next prime is 729139. The reversal of 729081 is 180927.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 210681 = 720^2 + 459^2 .

It is not a de Polignac number, because 729081 - 2³ = 729073 is a prime.

It is a super-2 number, since 2×729081² = 1063118209122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729041) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4420 + ... + 4581.

2⁷²⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

729081 is a deficient number, since it is larger than the sum of its proper divisors (360161).

729081 is an equidigital number, since it uses as much as digits as its factorization.

729081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9013 (or 9004 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 729081 is about 853.8624010928. The cubic root of 729081 is about 90.0033332099.

The spelling of 729081 in words is "seven hundred twenty-nine thousand, eighty-one".