| Base | Representation |
|---|---|
| bin | 100110001010000… |
| … | …0010001000000000 |
| 3 | 10022020010222212021 |
| 4 | 1030110002020000 |
| 5 | 10110230220000 |
| 6 | 331013411224 |
| 7 | 43504353241 |
| oct | 11424021000 |
| 9 | 3266128767 |
| 10 | 1280320000 |
| 11 | 5a7786403 |
| 12 | 2b8939b14 |
| 13 | 1753373cb |
| 14 | c207acc8 |
| 15 | 7760411a |
| hex | 4c502200 |
1280320000 has 100 divisors (see below), whose sum is σ = 3197449926. Its totient is φ = 512000000.
The previous prime is 1280319977. The next prime is 1280320007. The reversal of 1280320000 is 230821.
It is a happy number.
It can be written as a sum of positive squares in 5 ways, for example, as 42406144 + 1237913856 = 6512^2 + 35184^2 .
It is a tau number, because it is divible by the number of its divisors (100).
It is a Harshad number since it is a multiple of its sum of digits (16).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1280320007) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 318000 + ... + 322000.
Almost surely, 21280320000 is an apocalyptic number.
1280320000 is a gapful number since it is divisible by the number (10) 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 1280320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598724963).
1280320000 is an abundant number, since it is smaller than the sum of its proper divisors (1917129926).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1280320000 is an frugal number, since it uses more digits than its factorization.
1280320000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4039 (or 4008 counting only the distinct ones).
The product of its (nonzero) digits is 96, while the sum is 16.
The square root of 1280320000 is about 35781.5594964781. The cubic root of 1280320000 is about 1085.8575196862.
Adding to 1280320000 its reverse (230821), we get a palindrome (1280550821).
The spelling of 1280320000 in words is "one billion, two hundred eighty million, three hundred twenty thousand".
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