Base | Representation |
---|---|
bin | 10101000001011011101 |
3 | 1021222221101 |
4 | 2220023131 |
5 | 134020421 |
6 | 22433101 |
7 | 5566225 |
oct | 2501335 |
9 | 1258841 |
10 | 688861 |
11 | 430608 |
12 | 292791 |
13 | 1b1714 |
14 | 13d085 |
15 | d9191 |
hex | a82dd |
688861 has 2 divisors, whose sum is σ = 688862. Its totient is φ = 688860.
The previous prime is 688813. The next prime is 688867. The reversal of 688861 is 168886.
688861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 656100 + 32761 = 810^2 + 181^2 .
It is a cyclic number.
It is not a de Polignac number, because 688861 - 27 = 688733 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 688861.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (688867) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344430 + 344431.
It is an arithmetic number, because the mean of its divisors is an integer number (344431).
2688861 is an apocalyptic number.
It is an amenable number.
688861 is a deficient number, since it is larger than the sum of its proper divisors (1).
688861 is an equidigital number, since it uses as much as digits as its factorization.
688861 is an evil number, because the sum of its binary digits is even.
The product of its digits is 18432, while the sum is 37.
The square root of 688861 is about 829.9765056916. The cubic root of 688861 is about 88.3169100435.
The spelling of 688861 in words is "six hundred eighty-eight thousand, eight hundred sixty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •