| Base | Representation |
|---|---|
| bin | 101000101000010… |
| … | …100110010011110 |
| 3 | 1202111122220010000 |
| 4 | 220220110302132 |
| 5 | 2344001101200 |
| 6 | 151350155130 |
| 7 | 22615003425 |
| oct | 5050246236 |
| 9 | 1674586100 |
| 10 | 681659550 |
| 11 | 31a862a00 |
| 12 | 170352aa6 |
| 13 | ab2ba460 |
| 14 | 667622bc |
| 15 | 3ec9d300 |
| hex | 28a14c9e |
681659550 has 360 divisors, whose sum is σ = 2262933288. Its totient is φ = 151113600.
The previous prime is 681659549. The next prime is 681659551. The reversal of 681659550 is 55956186.
It is a happy number.
681659550 is a `hidden beast` number, since 6 + 8 + 1 + 6 + 595 + 50 = 666.
It is an interprime number because it is at equal distance from previous prime (681659549) and next prime (681659551).
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 681659496 and 681659505.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (681659551) 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 179 ways as a sum of consecutive naturals, for example, 6370597 + ... + 6370703.
Almost surely, 2681659550 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 681659550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1131466644).
681659550 is an abundant number, since it is smaller than the sum of its proper divisors (1581273738).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
681659550 is a wasteful number, since it uses less digits than its factorization.
681659550 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 166 (or 141 counting only the distinct ones).
The product of its (nonzero) digits is 324000, while the sum is 45.
The square root of 681659550 is about 26108.6106485964. The cubic root of 681659550 is about 880.0807217619.
It can be divided in two parts, 6816 and 59550, that added together give a palindrome (66366).
The spelling of 681659550 in words is "six hundred eighty-one million, six hundred fifty-nine thousand, five hundred fifty".
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