Base | Representation |
---|---|
bin | 10011011111101100100 |
3 | 1012110022000 |
4 | 2123331210 |
5 | 130420240 |
6 | 21405300 |
7 | 5300310 |
oct | 2337544 |
9 | 1173260 |
10 | 638820 |
11 | 3a6a56 |
12 | 269830 |
13 | 194a00 |
14 | 128b40 |
15 | c9430 |
hex | 9bf64 |
638820 has 144 divisors (see below), whose sum is σ = 2459520. Its totient is φ = 134784.
The previous prime is 638819. The next prime is 638839. The reversal of 638820 is 28836.
638820 is a `hidden beast` number, since 638 + 8 + 20 = 666.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a nialpdrome in base 15.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49134 + ... + 49146.
It is an arithmetic number, because the mean of its divisors is an integer number (17080).
2638820 is an apocalyptic number.
638820 is a gapful number since it is divisible by the number (60) 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 638820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1229760).
638820 is an abundant number, since it is smaller than the sum of its proper divisors (1820700).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
638820 is a wasteful number, since it uses less digits than its factorization.
638820 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 51 (or 30 counting only the distinct ones).
The product of its (nonzero) digits is 2304, while the sum is 27.
The square root of 638820 is about 799.2621597448. The cubic root of 638820 is about 86.1243918315.
The spelling of 638820 in words is "six hundred thirty-eight thousand, eight hundred twenty".
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