728723 has 2 divisors, whose sum is σ = 728724. Its totient is φ = 728722.

The previous prime is 728713. The next prime is 728729. The reversal of 728723 is 327827.

It is a strong prime.

It is an emirp because it is prime and its reverse (327827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728723 - 2⁶ = 728659 is a prime.

It is not a weakly prime, because it can be changed into another prime (728729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364361 + 364362.

It is an arithmetic number, because the mean of its divisors is an integer number (364362).

2⁷²⁸⁷²³ is an apocalyptic number.

728723 is a deficient number, since it is larger than the sum of its proper divisors (1).

728723 is an equidigital number, since it uses as much as digits as its factorization.

728723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 728723 is about 853.6527397016. The cubic root of 728723 is about 89.9885993789.

The spelling of 728723 in words is "seven hundred twenty-eight thousand, seven hundred twenty-three".