728811 has 8 divisors (see below), whose sum is σ = 1079760. Its totient is φ = 485856.

The previous prime is 728809. The next prime is 728813. The reversal of 728811 is 118827.

It is an interprime number because it is at equal distance from previous prime (728809) and next prime (728813).

It is not a de Polignac number, because 728811 - 2¹ = 728809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 26993 = 728811 / (7 + 2 + 8 + 8 + 1 + 1).

It is not an unprimeable number, because it can be changed into a prime (728813) 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 in 7 ways as a sum of consecutive naturals, for example, 13470 + ... + 13523.

It is an arithmetic number, because the mean of its divisors is an integer number (134970).

2⁷²⁸⁸¹¹ is an apocalyptic number.

728811 is a deficient number, since it is larger than the sum of its proper divisors (350949).

728811 is a wasteful number, since it uses less digits than its factorization.

728811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27002 (or 26996 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 728811 is about 853.7042813527. The cubic root of 728811 is about 89.9922215500.

The spelling of 728811 in words is "seven hundred twenty-eight thousand, eight hundred eleven".