Base | Representation |
---|---|
bin | 1000001011111… |
… | …11001001110101 |
3 | 11210020012212022 |
4 | 10011333021311 |
5 | 120040201021 |
6 | 10452002525 |
7 | 1462520111 |
oct | 405771165 |
9 | 153205768 |
10 | 68678261 |
11 | 35848aa3 |
12 | 1b000445 |
13 | 112c8032 |
14 | 919a741 |
15 | 60691ab |
hex | 417f275 |
68678261 has 2 divisors, whose sum is σ = 68678262. Its totient is φ = 68678260.
The previous prime is 68678243. The next prime is 68678263. The reversal of 68678261 is 16287686.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 63904036 + 4774225 = 7994^2 + 2185^2 .
It is a cyclic number.
It is not a de Polignac number, because 68678261 - 222 = 64483957 is a prime.
It is a Sophie Germain prime.
Together with 68678263, it forms a pair of twin primes.
It is a Chen prime.
It is a Curzon number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (68678263) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34339130 + 34339131.
It is an arithmetic number, because the mean of its divisors is an integer number (34339131).
Almost surely, 268678261 is an apocalyptic number.
It is an amenable number.
68678261 is a deficient number, since it is larger than the sum of its proper divisors (1).
68678261 is an equidigital number, since it uses as much as digits as its factorization.
68678261 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 193536, while the sum is 44.
The square root of 68678261 is about 8287.2348223035. The cubic root of 68678261 is about 409.5180953131.
The spelling of 68678261 in words is "sixty-eight million, six hundred seventy-eight thousand, two hundred sixty-one".
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