Base | Representation |
---|---|
bin | 111111111111111101… |
… | …101011110101100000 |
3 | 20120101010200021201000 |
4 | 333333331223311200 |
5 | 2111214012313411 |
6 | 51322523512000 |
7 | 4651626520230 |
oct | 777775536540 |
9 | 216333607630 |
10 | 68718869856 |
11 | 2716401302a |
12 | 11399988600 |
13 | 6631bb8590 |
14 | 347c807cc0 |
15 | 1bc2deb956 |
hex | ffff6bd60 |
68718869856 has 768 divisors, whose sum is σ = 262212249600. Its totient is φ = 17002192896.
The previous prime is 68718869851. The next prime is 68718869957. The reversal of 68718869856 is 65896881786.
It is a Harshad number since it is a multiple of its sum of digits (72).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (68718869851) by changing a digit.
It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 234535246 + ... + 234535538.
It is an arithmetic number, because the mean of its divisors is an integer number (341422200).
Almost surely, 268718869856 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 68718869856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131106124800).
68718869856 is an abundant number, since it is smaller than the sum of its proper divisors (193493379744).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
68718869856 is a wasteful number, since it uses less digits than its factorization.
68718869856 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 508 (or 494 counting only the distinct ones).
The product of its digits is 278691840, while the sum is 72.
The spelling of 68718869856 in words is "sixty-eight billion, seven hundred eighteen million, eight hundred sixty-nine thousand, eight hundred fifty-six".
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