Base | Representation |
---|---|
bin | 101001000011111… |
… | …000111001111001 |
3 | 1210000021000001221 |
4 | 221003320321321 |
5 | 2402323312434 |
6 | 152205112041 |
7 | 23033300104 |
oct | 5103707171 |
9 | 1700230057 |
10 | 688885369 |
11 | 323948857 |
12 | 172858621 |
13 | ac94a3a3 |
14 | 676c373b |
15 | 407292b4 |
hex | 290f8e79 |
688885369 has 2 divisors, whose sum is σ = 688885370. Its totient is φ = 688885368.
The previous prime is 688885333. The next prime is 688885387. The reversal of 688885369 is 963588886.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 414651769 + 274233600 = 20363^2 + 16560^2 .
It is a cyclic number.
It is not a de Polignac number, because 688885369 - 225 = 655330937 is a prime.
It is a super-2 number, since 2×6888853692 = 949126103244532322, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (688885319) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344442684 + 344442685.
It is an arithmetic number, because the mean of its divisors is an integer number (344442685).
Almost surely, 2688885369 is an apocalyptic number.
It is an amenable number.
688885369 is a deficient number, since it is larger than the sum of its proper divisors (1).
688885369 is an equidigital number, since it uses as much as digits as its factorization.
688885369 is an evil number, because the sum of its binary digits is even.
The product of its digits is 19906560, while the sum is 61.
The square root of 688885369 is about 26246.6258593367. The cubic root of 688885369 is about 883.1795145795.
The spelling of 688885369 in words is "six hundred eighty-eight million, eight hundred eighty-five thousand, three hundred sixty-nine".
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