| Base | Representation |
|---|---|
| bin | 1111010010100… |
| … | …00101010100110 |
| 3 | 22221100010002100 |
| 4 | 13221100222212 |
| 5 | 230313203203 |
| 6 | 20420552530 |
| 7 | 3115110114 |
| oct | 751205246 |
| 9 | 287303070 |
| 10 | 128256678 |
| 11 | 66441160 |
| 12 | 36b52746 |
| 13 | 20758134 |
| 14 | 13068ab4 |
| 15 | b3d6ea3 |
| hex | 7a50aa6 |
128256678 has 48 divisors (see below), whose sum is σ = 308318400. Its totient is φ = 38203440.
The previous prime is 128256677. The next prime is 128256679. The reversal of 128256678 is 876652821.
128256678 is a `hidden beast` number, since 1 + 2 + 82 + 566 + 7 + 8 = 666.
It is an interprime number because it is at equal distance from previous prime (128256677) and next prime (128256679).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (128256673) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6193 + ... + 17171.
It is an arithmetic number, because the mean of its divisors is an integer number (6423300).
Almost surely, 2128256678 is an apocalyptic number.
128256678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 128256678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154159200).
128256678 is an abundant number, since it is smaller than the sum of its proper divisors (180061722).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
128256678 is a wasteful number, since it uses less digits than its factorization.
128256678 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11057 (or 11054 counting only the distinct ones).
The product of its digits is 322560, while the sum is 45.
The square root of 128256678 is about 11325.0464899708. The cubic root of 128256678 is about 504.3050638004.
It can be divided in two parts, 12825 and 6678, that added together give a triangular number (19503 = T197).
The spelling of 128256678 in words is "one hundred twenty-eight million, two hundred fifty-six thousand, six hundred seventy-eight".
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