Base | Representation |
---|---|
bin | 11010101101110001… |
… | …010001111100010010 |
3 | 2202001010020011100122 |
4 | 122231301101330102 |
5 | 432221401240230 |
6 | 21102222550242 |
7 | 2033563004255 |
oct | 325561217422 |
9 | 82033204318 |
10 | 28685180690 |
11 | 11190044901 |
12 | 5686738382 |
13 | 2921b6baca |
14 | 156198b09c |
15 | b2d4acbe5 |
hex | 6adc51f12 |
28685180690 has 32 divisors (see below), whose sum is σ = 55211905584. Its totient is φ = 10692198400.
The previous prime is 28685180681. The next prime is 28685180701. The reversal of 28685180690 is 9608158682.
It is a Cunningham number, because it is equal to 1693672+1.
It can be written as a sum of positive squares in 8 ways, for example, as 17082228601 + 11602952089 = 130699^2 + 107717^2 .
It is a super-2 number, since 2×286851806902 (a number of 22 digits) contains 22 as substring.
It is a Curzon number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818159 + ... + 852498.
Almost surely, 228685180690 is an apocalyptic number.
28685180690 is a deficient number, since it is larger than the sum of its proper divisors (26526724894).
28685180690 is a wasteful number, since it uses less digits than its factorization.
28685180690 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1670782.
The product of its (nonzero) digits is 1658880, while the sum is 53.
The spelling of 28685180690 in words is "twenty-eight billion, six hundred eighty-five million, one hundred eighty thousand, six hundred ninety".
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