729083281 has 4 divisors (see below), whose sum is σ = 732538864. Its totient is φ = 725627700.

The previous prime is 729083269. The next prime is 729083429. The reversal of 729083281 is 182380927.

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, and also an emirpimes, since its reverse is a distinct semiprime: 182380927 = 139 ⋅1312093.

It is a cyclic number.

It is not a de Polignac number, because 729083281 - 2⁵ = 729083249 is a prime.

It is a super-2 number, since 2×729083281² = 1063124861267449922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729083221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1727475 + ... + 1727896.

It is an arithmetic number, because the mean of its divisors is an integer number (183134716).

Almost surely, 2^729083281 is an apocalyptic number.

It is an amenable number.

729083281 is a deficient number, since it is larger than the sum of its proper divisors (3455583).

729083281 is a wasteful number, since it uses less digits than its factorization.

729083281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455582.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 729083281 is about 27001.5421966968. The cubic root of 729083281 is about 900.0342707115.

The spelling of 729083281 in words is "seven hundred twenty-nine million, eighty-three thousand, two hundred eighty-one".