728684573 has 4 divisors (see below), whose sum is σ = 738947808. Its totient is φ = 718421340.

The previous prime is 728684557. The next prime is 728684591. The reversal of 728684573 is 375486827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 375486827 = 67 ⋅5604281.

It is a cyclic number.

It is not a de Polignac number, because 728684573 - 2⁴ = 728684557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728684503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5131511 + ... + 5131652.

It is an arithmetic number, because the mean of its divisors is an integer number (184736952).

Almost surely, 2^728684573 is an apocalyptic number.

It is an amenable number.

728684573 is a deficient number, since it is larger than the sum of its proper divisors (10263235).

728684573 is a wasteful number, since it uses less digits than its factorization.

728684573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10263234.

The product of its digits is 2257920, while the sum is 50.

The square root of 728684573 is about 26994.1581272689. The cubic root of 728684573 is about 899.8701759241.

The spelling of 728684573 in words is "seven hundred twenty-eight million, six hundred eighty-four thousand, five hundred seventy-three".