728103172852805 has 4 divisors (see below), whose sum is σ = 873723807423372. Its totient is φ = 582482538282240.

The previous prime is 728103172852799. The next prime is 728103172852829. The reversal of 728103172852805 is 508258271301827.

728103172852805 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 187975918205761 + 540127254647044 = 13710431^2 + 23240638^2 .

It is not a de Polignac number, because 728103172852805 - 2²⁶ = 728103105743941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72810317285276 + ... + 72810317285285.

It is an arithmetic number, because the mean of its divisors is an integer number (218430951855843).

Almost surely, 2^{728103172852805} is an apocalyptic number.

It is an amenable number.

728103172852805 is a deficient number, since it is larger than the sum of its proper divisors (145620634570567).

728103172852805 is a wasteful number, since it uses less digits than its factorization.

728103172852805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145620634570566.

The product of its (nonzero) digits is 15052800, while the sum is 59.

The spelling of 728103172852805 in words is "seven hundred twenty-eight trillion, one hundred three billion, one hundred seventy-two million, eight hundred fifty-two thousand, eight hundred five".