| Base | Representation |
|---|---|
| bin | 1001000100101100100000110… |
| … | …1110001101111010101110000 |
| 3 | 10002201200020022002110200121000 |
| 4 | 2101023020031301233111300 |
| 5 | 1132141340032213302121 |
| 6 | 10141534201543002000 |
| 7 | 251325523160421666 |
| oct | 22113101561572560 |
| 9 | 3081606262420530 |
| 10 | 638481479431536 |
| 11 | 175492524a634a4 |
| 12 | 5b739ba3739300 |
| 13 | 21535711953330 |
| 14 | b3949504a2c36 |
| 15 | 4dc357db09526 |
| hex | 244b20dc6f570 |
638481479431536 has 480 divisors, whose sum is σ = 2159337031709760. Its totient is φ = 178935084564480.
The previous prime is 638481479431511. The next prime is 638481479431591. The reversal of 638481479431536 is 635134974184836.
638481479431536 is a `hidden beast` number, since 6 + 3 + 8 + 4 + 8 + 1 + 47 + 9 + 43 + 1 + 536 = 666.
It is a super-2 number, since 2×6384814794315362 (a number of 30 digits) contains 22 as substring.
It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (72).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 88269076 + ... + 95228108.
It is an arithmetic number, because the mean of its divisors is an integer number (4498618816062).
Almost surely, 2638481479431536 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 638481479431536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1079668515854880).
638481479431536 is an abundant number, since it is smaller than the sum of its proper divisors (1520855552278224).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
638481479431536 is a wasteful number, since it uses less digits than its factorization.
638481479431536 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6959142 (or 6959099 counting only the distinct ones).
The product of its digits is 1254113280, while the sum is 72.
The spelling of 638481479431536 in words is "six hundred thirty-eight trillion, four hundred eighty-one billion, four hundred seventy-nine million, four hundred thirty-one thousand, five hundred thirty-six".
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