728617723 has 4 divisors (see below), whose sum is σ = 728798400. Its totient is φ = 728437048.

The previous prime is 728617717. The next prime is 728617751. The reversal of 728617723 is 327716827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728617723 - 2¹⁷ = 728486651 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 728617723.

It is not an unprimeable number, because it can be changed into a prime (728617763) 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, 84148 + ... + 92401.

It is an arithmetic number, because the mean of its divisors is an integer number (182199600).

Almost surely, 2^728617723 is an apocalyptic number.

728617723 is a deficient number, since it is larger than the sum of its proper divisors (180677).

728617723 is a wasteful number, since it uses less digits than its factorization.

728617723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180676.

The product of its digits is 197568, while the sum is 43.

The square root of 728617723 is about 26992.9198679950. The cubic root of 728617723 is about 899.8426568561.

The spelling of 728617723 in words is "seven hundred twenty-eight million, six hundred seventeen thousand, seven hundred twenty-three".