728573 has 2 divisors, whose sum is σ = 728574. Its totient is φ = 728572.

The previous prime is 728561. The next prime is 728579. The reversal of 728573 is 375827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597529 + 131044 = 773^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 728573 - 2⁴ = 728557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364286 + 364287.

It is an arithmetic number, because the mean of its divisors is an integer number (364287).

2⁷²⁸⁵⁷³ is an apocalyptic number.

It is an amenable number.

728573 is a deficient number, since it is larger than the sum of its proper divisors (1).

728573 is an equidigital number, since it uses as much as digits as its factorization.

728573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 32.

The square root of 728573 is about 853.5648774405. The cubic root of 728573 is about 89.9824245516.

The spelling of 728573 in words is "seven hundred twenty-eight thousand, five hundred seventy-three".