728891 has 2 divisors, whose sum is σ = 728892. Its totient is φ = 728890.

The previous prime is 728881. The next prime is 728899. The reversal of 728891 is 198827.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (198827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728891 - 2¹⁴ = 712507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (728899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364445 + 364446.

It is an arithmetic number, because the mean of its divisors is an integer number (364446).

2⁷²⁸⁸⁹¹ is an apocalyptic number.

728891 is a deficient number, since it is larger than the sum of its proper divisors (1).

728891 is an equidigital number, since it uses as much as digits as its factorization.

728891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 728891 is about 853.7511346991. The cubic root of 728891 is about 89.9955141797.

The spelling of 728891 in words is "seven hundred twenty-eight thousand, eight hundred ninety-one".