729128469 has 8 divisors (see below), whose sum is σ = 1005694560. Its totient is φ = 469324016.

The previous prime is 729128459. The next prime is 729128471. The reversal of 729128469 is 964821927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 729128469 - 2⁷ = 729128341 is a prime.

It is a super-2 number, since 2×729128469² = 1063256648612567922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729128429) 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 7 ways as a sum of consecutive naturals, for example, 4190307 + ... + 4190480.

It is an arithmetic number, because the mean of its divisors is an integer number (125711820).

Almost surely, 2^729128469 is an apocalyptic number.

It is an amenable number.

729128469 is a deficient number, since it is larger than the sum of its proper divisors (276566091).

729128469 is a wasteful number, since it uses less digits than its factorization.

729128469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380819.

The product of its digits is 435456, while the sum is 48.

The square root of 729128469 is about 27002.3789507517. The cubic root of 729128469 is about 900.0528647960.

The spelling of 729128469 in words is "seven hundred twenty-nine million, one hundred twenty-eight thousand, four hundred sixty-nine".