728165723 has 8 divisors (see below), whose sum is σ = 749024976. Its totient is φ = 707594400.

The previous prime is 728165687. The next prime is 728165731. The reversal of 728165723 is 327561827.

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 728165723 - 2⁸ = 728165467 is a prime.

It is a super-2 number, since 2×728165723² = 1060450640304225458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728165773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66848 + ... + 76973.

It is an arithmetic number, because the mean of its divisors is an integer number (93628122).

Almost surely, 2^728165723 is an apocalyptic number.

728165723 is a deficient number, since it is larger than the sum of its proper divisors (20859253).

728165723 is a wasteful number, since it uses less digits than its factorization.

728165723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143965.

The product of its digits is 141120, while the sum is 41.

The square root of 728165723 is about 26984.5460032219. The cubic root of 728165723 is about 899.6565450803.

The spelling of 728165723 in words is "seven hundred twenty-eight million, one hundred sixty-five thousand, seven hundred twenty-three".