728358203173 has 4 divisors (see below), whose sum is σ = 729665848620. Its totient is φ = 727050557728.

The previous prime is 728358203123. The next prime is 728358203201. The reversal of 728358203173 is 371302853827.

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 179926127329 + 548432075844 = 424177^2 + 740562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728358203173 is a prime.

It is a super-2 number, since 2×728358203173² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728358203113) 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, 653821888 + ... + 653823001.

It is an arithmetic number, because the mean of its divisors is an integer number (182416462155).

Almost surely, 2^728358203173 is an apocalyptic number.

It is an amenable number.

728358203173 is a deficient number, since it is larger than the sum of its proper divisors (1307645447).

728358203173 is a wasteful number, since it uses less digits than its factorization.

728358203173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307645446.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 728358203173 in words is "seven hundred twenty-eight billion, three hundred fifty-eight million, two hundred three thousand, one hundred seventy-three".