728437617109 has 8 divisors (see below), whose sum is σ = 771935575320. Its totient is φ = 686164953600.

The previous prime is 728437617091. The next prime is 728437617113. The reversal of 728437617109 is 901716734827.

It can be written as a sum of positive squares in 4 ways, for example, as 5082264100 + 723355353009 = 71290^2 + 850503^2 .

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 728437617109 - 2⁹ = 728437616597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728437617109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728437617709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306322452 + ... + 306324829.

It is an arithmetic number, because the mean of its divisors is an integer number (96491946915).

Almost surely, 2^728437617109 is an apocalyptic number.

It is an amenable number.

728437617109 is a deficient number, since it is larger than the sum of its proper divisors (43497958211).

728437617109 is a wasteful number, since it uses less digits than its factorization.

728437617109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612647351.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 728437617109 in words is "seven hundred twenty-eight billion, four hundred thirty-seven million, six hundred seventeen thousand, one hundred nine".