729090281 has 4 divisors (see below), whose sum is σ = 729230292. Its totient is φ = 728950272.

The previous prime is 729090269. The next prime is 729090301. The reversal of 729090281 is 182090927.

729090281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98327056 + 630763225 = 9916^2 + 25115^2 .

It is a cyclic number.

It is not a de Polignac number, because 729090281 - 2¹⁴ = 729073897 is a prime.

It is a super-3 number, since 3×729090281³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729090881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61880 + ... + 72713.

It is an arithmetic number, because the mean of its divisors is an integer number (182307573).

Almost surely, 2^729090281 is an apocalyptic number.

It is an amenable number.

729090281 is a deficient number, since it is larger than the sum of its proper divisors (140011).

729090281 is a wasteful number, since it uses less digits than its factorization.

729090281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140010.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 729090281 is about 27001.6718186115. The cubic root of 729090281 is about 900.0371511413.

The spelling of 729090281 in words is "seven hundred twenty-nine million, ninety thousand, two hundred eighty-one".