| Base | Representation |
|---|---|
| bin | 10010101011100111110… |
| … | …00100011010000011100 |
| 3 | 2021100211201102121011200 |
| 4 | 21111303320203100130 |
| 5 | 41004044422101140 |
| 6 | 1210514315115500 |
| 7 | 64242511535646 |
| oct | 11256370432034 |
| 9 | 2240751377150 |
| 10 | 641894331420 |
| 11 | 2282536858a1 |
| 12 | a44a1142b90 |
| 13 | 486b830a424 |
| 14 | 230d4281896 |
| 15 | 11a6cce3030 |
| hex | 9573e2341c |
641894331420 has 288 divisors, whose sum is σ = 2080577378880. Its totient is φ = 159725260800.
The previous prime is 641894331413. The next prime is 641894331427. The reversal of 641894331420 is 24133498146.
641894331420 is a `hidden beast` number, since 6 + 4 + 189 + 43 + 3 + 1 + 420 = 666.
It is an interprime number because it is at equal distance from previous prime (641894331413) and next prime (641894331427).
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (641894331427) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 68043024 + ... + 68052456.
It is an arithmetic number, because the mean of its divisors is an integer number (7224227010).
Almost surely, 2641894331420 is an apocalyptic number.
641894331420 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 641894331420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040288689440).
641894331420 is an abundant number, since it is smaller than the sum of its proper divisors (1438683047460).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
641894331420 is a wasteful number, since it uses less digits than its factorization.
641894331420 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9765 (or 9760 counting only the distinct ones).
The product of its (nonzero) digits is 497664, while the sum is 45.
The spelling of 641894331420 in words is "six hundred forty-one billion, eight hundred ninety-four million, three hundred thirty-one thousand, four hundred twenty".
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