728181005 has 4 divisors (see below), whose sum is σ = 873817212. Its totient is φ = 582544800.

The previous prime is 728180983. The next prime is 728181007. The reversal of 728181005 is 500181827.

It is a happy number.

728181005 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 550465444 + 177715561 = 23462^2 + 13331^2 .

It is not a de Polignac number, because 728181005 - 2²⁰ = 727132429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728181007) 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, 72818096 + ... + 72818105.

It is an arithmetic number, because the mean of its divisors is an integer number (218454303).

Almost surely, 2^728181005 is an apocalyptic number.

It is an amenable number.

728181005 is a deficient number, since it is larger than the sum of its proper divisors (145636207).

728181005 is a wasteful number, since it uses less digits than its factorization.

728181005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145636206.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 728181005 is about 26984.8291638098. The cubic root of 728181005 is about 899.6628387278.

The spelling of 728181005 in words is "seven hundred twenty-eight million, one hundred eighty-one thousand, five".