| Base | Representation |
|---|---|
| bin | 110110101110… |
| … | …0000100110000 |
| 3 | 1222222112111000 |
| 4 | 1231130010300 |
| 5 | 24321014223 |
| 6 | 2502522000 |
| 7 | 465564330 |
| oct | 155340460 |
| 9 | 58875430 |
| 10 | 28688688 |
| 11 | 15215266 |
| 12 | 9736300 |
| 13 | 5c36172 |
| 14 | 3b4b0c0 |
| 15 | 27ba543 |
| hex | 1b5c130 |
28688688 has 160 divisors (see below), whose sum is σ = 96422400. Its totient is φ = 7997184.
The previous prime is 28688687. The next prime is 28688711. The reversal of 28688688 is 88688682.
It is a super-2 number, since 2×286886882 = 1646081638322688, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (54).
It is a nude number because it is divisible by every one of its digits.
Its product of digits (2359296) is a multiple of the sum of its prime factors (256).
It is not an unprimeable number, because it can be changed into a prime (28688687) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160183 + ... + 160361.
It is an arithmetic number, because the mean of its divisors is an integer number (602640).
Almost surely, 228688688 is an apocalyptic number.
28688688 is a gapful number since it is divisible by the number (28) 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 28688688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48211200).
28688688 is an abundant number, since it is smaller than the sum of its proper divisors (67733712).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
28688688 is a wasteful number, since it uses less digits than its factorization.
28688688 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 256 (or 244 counting only the distinct ones).
The product of its digits is 2359296, while the sum is 54.
The square root of 28688688 is about 5356.1822224417. The cubic root of 28688688 is about 306.1283582990.
The spelling of 28688688 in words is "twenty-eight million, six hundred eighty-eight thousand, six hundred eighty-eight".
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