729142881 has 4 divisors (see below), whose sum is σ = 972190512. Its totient is φ = 486095252.

The previous prime is 729142859. The next prime is 729142891. The reversal of 729142881 is 188241927.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729142881 is a prime.

It is a super-2 number, since 2×729142881² = 1063298681825960322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (729142891) 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, 121523811 + ... + 121523816.

It is an arithmetic number, because the mean of its divisors is an integer number (243047628).

Almost surely, 2^729142881 is an apocalyptic number.

It is an amenable number.

729142881 is a deficient number, since it is larger than the sum of its proper divisors (243047631).

729142881 is a wasteful number, since it uses less digits than its factorization.

729142881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243047630.

The product of its digits is 64512, while the sum is 42.

The square root of 729142881 is about 27002.6458148086. The cubic root of 729142881 is about 900.0587949244.

The spelling of 729142881 in words is "seven hundred twenty-nine million, one hundred forty-two thousand, eight hundred eighty-one".