Base | Representation |
---|---|
bin | 100110001011001… |
… | …001011010100111 |
3 | 1122122010112221220 |
4 | 212023021122213 |
5 | 2302424100414 |
6 | 143315111423 |
7 | 21604534464 |
oct | 4613113247 |
9 | 1578115856 |
10 | 640456359 |
11 | 2a9580384 |
12 | 15a5a2573 |
13 | a28c207a |
14 | 610b866b |
15 | 3b35eca9 |
hex | 262c96a7 |
640456359 has 8 divisors (see below), whose sum is σ = 856321920. Its totient is φ = 425780856.
The previous prime is 640456343. The next prime is 640456361. The reversal of 640456359 is 953654046.
640456359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 640456359 - 24 = 640456343 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 640456359.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (640456309) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296257 + ... + 298410.
It is an arithmetic number, because the mean of its divisors is an integer number (107040240).
Almost surely, 2640456359 is an apocalyptic number.
640456359 is a deficient number, since it is larger than the sum of its proper divisors (215865561).
640456359 is a wasteful number, since it uses less digits than its factorization.
640456359 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 595029.
The product of its (nonzero) digits is 388800, while the sum is 42.
The square root of 640456359 is about 25307.2392607333. The cubic root of 640456359 is about 861.9786597753.
The spelling of 640456359 in words is "six hundred forty million, four hundred fifty-six thousand, three hundred fifty-nine".
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