728968165 has 4 divisors (see below), whose sum is σ = 874761804. Its totient is φ = 583174528.

The previous prime is 728968127. The next prime is 728968171. The reversal of 728968165 is 561869827.

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 141681409 + 587286756 = 11903^2 + 24234^2 .

It is a cyclic number.

It is not a de Polignac number, because 728968165 - 2¹⁵ = 728935397 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, 72896812 + ... + 72896821.

It is an arithmetic number, because the mean of its divisors is an integer number (218690451).

Almost surely, 2^728968165 is an apocalyptic number.

It is an amenable number.

728968165 is a deficient number, since it is larger than the sum of its proper divisors (145793639).

728968165 is a wasteful number, since it uses less digits than its factorization.

728968165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145793638.

The product of its digits is 1451520, while the sum is 52.

The square root of 728968165 is about 26999.4104565266. The cubic root of 728968165 is about 899.9868989862.

The spelling of 728968165 in words is "seven hundred twenty-eight million, nine hundred sixty-eight thousand, one hundred sixty-five".