Base | Representation |
---|---|
bin | 10011101010011111010 |
3 | 1012201212200 |
4 | 2131103322 |
5 | 131104341 |
6 | 21451030 |
7 | 5322363 |
oct | 2352372 |
9 | 1181780 |
10 | 644346 |
11 | 40011a |
12 | 270a76 |
13 | 197391 |
14 | 12ab6a |
15 | cadb6 |
hex | 9d4fa |
644346 has 12 divisors (see below), whose sum is σ = 1396122. Its totient is φ = 214776.
The previous prime is 644341. The next prime is 644353. The reversal of 644346 is 643446.
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 632025 + 12321 = 795^2 + 111^2 .
It is not an unprimeable number, because it can be changed into a prime (644341) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17881 + ... + 17916.
2644346 is an apocalyptic number.
644346 is an abundant number, since it is smaller than the sum of its proper divisors (751776).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
644346 is a wasteful number, since it uses less digits than its factorization.
644346 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 35805 (or 35802 counting only the distinct ones).
The product of its digits is 6912, while the sum is 27.
The square root of 644346 is about 802.7116543317. The cubic root of 644346 is about 86.3720138268.
Subtracting from 644346 its reverse (643446), we obtain a square (900 = 302).
It can be divided in two parts, 644 and 346, that added together give a triangular number (990 = T44).
The spelling of 644346 in words is "six hundred forty-four thousand, three hundred forty-six".
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