| Base | Representation |
|---|---|
| bin | 100101100110010… |
| … | …1000101110010000 |
| 3 | 10020220221002222000 |
| 4 | 1023030220232100 |
| 5 | 10040432304403 |
| 6 | 325104314000 |
| 7 | 43156311660 |
| oct | 11314505620 |
| 9 | 3226832860 |
| 10 | 1261603728 |
| 11 | 598162610 |
| 12 | 2b2612900 |
| 13 | 1714b33a8 |
| 14 | bd7a81a0 |
| 15 | 75b587a3 |
| hex | 4b328b90 |
1261603728 has 640 divisors, whose sum is σ = 5039677440. Its totient is φ = 291962880.
The previous prime is 1261603699. The next prime is 1261603729. The reversal of 1261603728 is 8273061621.
1261603728 is a `hidden beast` number, since 1 + 2 + 616 + 0 + 37 + 2 + 8 = 666.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 1261603692 and 1261603701.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1261603729) 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 127 ways as a sum of consecutive naturals, for example, 13006176 + ... + 13006272.
It is an arithmetic number, because the mean of its divisors is an integer number (7874496).
Almost surely, 21261603728 is an apocalyptic number.
1261603728 is a gapful number since it is divisible by the number (18) 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 1261603728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2519838720).
1261603728 is an abundant number, since it is smaller than the sum of its proper divisors (3778073712).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1261603728 is a wasteful number, since it uses less digits than its factorization.
1261603728 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 172 (or 160 counting only the distinct ones).
The product of its (nonzero) digits is 24192, while the sum is 36.
The square root of 1261603728 is about 35519.0614740874. The cubic root of 1261603728 is about 1080.5403468919.
The spelling of 1261603728 in words is "one billion, two hundred sixty-one million, six hundred three thousand, seven hundred twenty-eight".
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