Base | Representation |
---|---|
bin | 1111010010000… |
… | …11100010100011 |
3 | 22221020101100010 |
4 | 13221003202203 |
5 | 230304443130 |
6 | 20415500003 |
7 | 3114464301 |
oct | 751034243 |
9 | 287211303 |
10 | 128202915 |
11 | 66404825 |
12 | 36b27603 |
13 | 20739819 |
14 | 13053271 |
15 | b3c60b0 |
hex | 7a438a3 |
128202915 has 16 divisors (see below), whose sum is σ = 205384608. Its totient is φ = 68288256.
The previous prime is 128202911. The next prime is 128202931. The reversal of 128202915 is 519202821.
It is not a de Polignac number, because 128202915 - 22 = 128202911 is a prime.
It is not an unprimeable number, because it can be changed into a prime (128202911) 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 15 ways as a sum of consecutive naturals, for example, 7869 + ... + 17841.
It is an arithmetic number, because the mean of its divisors is an integer number (12836538).
Almost surely, 2128202915 is an apocalyptic number.
128202915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
128202915 is a deficient number, since it is larger than the sum of its proper divisors (77181693).
128202915 is an equidigital number, since it uses as much as digits as its factorization.
128202915 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10838.
The product of its (nonzero) digits is 2880, while the sum is 30.
The square root of 128202915 is about 11322.6726085320. The cubic root of 128202915 is about 504.2345886073.
The spelling of 128202915 in words is "one hundred twenty-eight million, two hundred two thousand, nine hundred fifteen".
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