| Base | Representation |
|---|---|
| bin | 100110010111010… |
| … | …000111100010000 |
| 3 | 1122212002221101000 |
| 4 | 212113100330100 |
| 5 | 2304232223122 |
| 6 | 143511142000 |
| 7 | 21643534536 |
| oct | 4627207420 |
| 9 | 1585087330 |
| 10 | 643632912 |
| 11 | 30034aa2a |
| 12 | 15b674900 |
| 13 | a3464ba0 |
| 14 | 616a4156 |
| 15 | 3b78b0ac |
| hex | 265d0f10 |
643632912 has 160 divisors (see below), whose sum is σ = 2054312960. Its totient is φ = 191600640.
The previous prime is 643632907. The next prime is 643632917. The reversal of 643632912 is 219236346.
643632912 is a `hidden beast` number, since 6 + 4 + 3 + 632 + 9 + 12 = 666.
It is an interprime number because it is at equal distance from previous prime (643632907) and next prime (643632917).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a nude number because it is divisible by every one of its digits.
It is not an unprimeable number, because it can be changed into a prime (643632917) 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 31 ways as a sum of consecutive naturals, for example, 172248 + ... + 175944.
It is an arithmetic number, because the mean of its divisors is an integer number (12839456).
Almost surely, 2643632912 is an apocalyptic number.
643632912 is a gapful number since it is divisible by the number (62) 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 643632912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027156480).
643632912 is an abundant number, since it is smaller than the sum of its proper divisors (1410680048).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
643632912 is a wasteful number, since it uses less digits than its factorization.
643632912 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3758 (or 3746 counting only the distinct ones).
The product of its digits is 46656, while the sum is 36.
The square root of 643632912 is about 25369.9214031104. The cubic root of 643632912 is about 863.4013986410.
The spelling of 643632912 in words is "six hundred forty-three million, six hundred thirty-two thousand, nine hundred twelve".
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