728911 has 2 divisors, whose sum is σ = 728912. Its totient is φ = 728910.
The previous prime is 728899. The next prime is 728921. The reversal of 728911 is 119827.
It is a strong prime.
It is an emirp because it is prime and its reverse (119827) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 728911 - 219 = 204623 is a prime.
It is a super-2 number, since 2×7289112 = 1062622491842, which contains 22 as substring.
It is a Chen prime.
728911 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 728911.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (728921) 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, 364455 + 364456.
It is an arithmetic number, because the mean of its divisors is an integer number (364456).
2728911 is an apocalyptic number.
728911 is a deficient number, since it is larger than the sum of its proper divisors (1).
728911 is an equidigital number, since it uses as much as digits as its factorization.
728911 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1008, while the sum is 28.
The square root of 728911 is about 853.7628476339. The cubic root of 728911 is about 89.9963372995.
The spelling of 728911 in words is "seven hundred twenty-eight thousand, nine hundred eleven".
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