| Base | Representation |
|---|---|
| bin | 10011101100111… |
| … | …11101110000000 |
| 3 | 102112000010102012 |
| 4 | 21312133232000 |
| 5 | 314302440030 |
| 6 | 24222312052 |
| 7 | 4044601520 |
| oct | 1166375600 |
| 9 | 375003365 |
| 10 | 165280640 |
| 11 | 85329878 |
| 12 | 47428628 |
| 13 | 2831c1c5 |
| 14 | 17d45680 |
| 15 | e79c095 |
| hex | 9d9fb80 |
165280640 has 128 divisors (see below), whose sum is σ = 458265600. Its totient is φ = 55830528.
The previous prime is 165280631. The next prime is 165280649. The reversal of 165280640 is 46082561.
It is an interprime number because it is at equal distance from previous prime (165280631) and next prime (165280649).
It is a tau number, because it is divible by the number of its divisors (128).
It is a Harshad number since it is a multiple of its sum of digits (32).
It is a junction number, because it is equal to n+sod(n) for n = 165280597 and 165280606.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (165280649) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353687 + ... + 354153.
It is an arithmetic number, because the mean of its divisors is an integer number (3580200).
Almost surely, 2165280640 is an apocalyptic number.
165280640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 165280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229132800).
165280640 is an abundant number, since it is smaller than the sum of its proper divisors (292984960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
165280640 is an equidigital number, since it uses as much as digits as its factorization.
165280640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 572 (or 560 counting only the distinct ones).
The product of its (nonzero) digits is 11520, while the sum is 32.
The square root of 165280640 is about 12856.1518348221. The cubic root of 165280640 is about 548.7914399411.
The spelling of 165280640 in words is "one hundred sixty-five million, two hundred eighty thousand, six hundred forty".
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