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728831 is a prime number
BaseRepresentation
bin10110001111011111111
31101000202202
42301323333
5141310311
623342115
76123605
oct2617377
91330682
10728831
11458644
122b193b
131c697c
1414d875
15e5e3b
hexb1eff

728831 has 2 divisors, whose sum is σ = 728832. Its totient is φ = 728830.

The previous prime is 728813. The next prime is 728837. The reversal of 728831 is 138827.

Together with previous prime (728813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728831 - 210 = 727807 is a prime.

It is a super-3 number, since 3×7288313 = 1161453332613240573, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 728794 and 728803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364415 + 364416.

It is an arithmetic number, because the mean of its divisors is an integer number (364416).

2728831 is an apocalyptic number.

728831 is a deficient number, since it is larger than the sum of its proper divisors (1).

728831 is an equidigital number, since it uses as much as digits as its factorization.

728831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 728831 is about 853.7159949304. The cubic root of 728831 is about 89.9930447300.

The spelling of 728831 in words is "seven hundred twenty-eight thousand, eight hundred thirty-one".