Base | Representation |
---|---|
bin | 10010100110111010110… |
… | …00100000101100100000 |
3 | 2021010022202020020201100 |
4 | 21103131120200230200 |
5 | 40433412023144140 |
6 | 1205420000034400 |
7 | 64123111542600 |
oct | 11233530405440 |
9 | 2233282206640 |
10 | 639369349920 |
11 | 227178369924 |
12 | a3ab7602a00 |
13 | 483a5172332 |
14 | 22d34baac00 |
15 | 119712d0530 |
hex | 94dd620b20 |
639369349920 has 1728 divisors, whose sum is σ = 2793338926560. Its totient is φ = 132252696576.
The previous prime is 639369349919. The next prime is 639369349943. The reversal of 639369349920 is 29943963936.
639369349920 is a `hidden beast` number, since 6 + 3 + 9 + 36 + 93 + 499 + 20 = 666.
It can be written as a sum of positive squares in 16 ways, for example, as 5377582224 + 633991767696 = 73332^2 + 796236^2 .
It is a Harshad number since it is a multiple of its sum of digits (63).
It is an unprimeable number.
It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 5658135784 + ... + 5658135896.
Almost surely, 2639369349920 is an apocalyptic number.
639369349920 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 639369349920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396669463280).
639369349920 is an abundant number, since it is smaller than the sum of its proper divisors (2153969576640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
639369349920 is a wasteful number, since it uses less digits than its factorization.
639369349920 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 307 (or 289 counting only the distinct ones).
The product of its (nonzero) digits is 51018336, while the sum is 63.
The spelling of 639369349920 in words is "six hundred thirty-nine billion, three hundred sixty-nine million, three hundred forty-nine thousand, nine hundred twenty".
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