729805805 has 16 divisors (see below), whose sum is σ = 896448384. Its totient is φ = 570212160.

The previous prime is 729805799. The next prime is 729805807. The reversal of 729805805 is 508508927.

It is not a de Polignac number, because 729805805 - 2²⁰ = 728757229 is a prime.

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 (729805807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28379 + ... + 47591.

It is an arithmetic number, because the mean of its divisors is an integer number (56028024).

Almost surely, 2^729805805 is an apocalyptic number.

It is an amenable number.

729805805 is a deficient number, since it is larger than the sum of its proper divisors (166642579).

729805805 is a wasteful number, since it uses less digits than its factorization.

729805805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19396.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 729805805 is about 27014.9181934723. The cubic root of 729805805 is about 900.3314848895.

The spelling of 729805805 in words is "seven hundred twenty-nine million, eight hundred five thousand, eight hundred five".