| Base | Representation |
|---|---|
| bin | 1101000111110111110011… |
| … | …01101010000001001010000 |
| 3 | 10210011202222021122201012000 |
| 4 | 12203323321231100021100 |
| 5 | 12240301213044341140 |
| 6 | 141213025253434000 |
| 7 | 6035622453035145 |
| oct | 643737155201120 |
| 9 | 123152867581160 |
| 10 | 28857779683920 |
| 11 | 9216574346760 |
| 12 | 32a09b803b900 |
| 13 | 131437a5b8b35 |
| 14 | 71aa1c8aa3cc |
| 15 | 3509cc95ea30 |
| hex | 1a3ef9b50250 |
28857779683920 has 1280 divisors, whose sum is σ = 116993540505600. Its totient is φ = 6462602496000.
The previous prime is 28857779683913. The next prime is 28857779683927. The reversal of 28857779683920 is 2938697775882.
28857779683920 is a `hidden beast` number, since 2 + 8 + 8 + 577 + 7 + 9 + 6 + 8 + 39 + 2 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (28857779683913) and next prime (28857779683927).
It is a self number, because there is not a number n which added to its sum of digits gives 28857779683920.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28857779683927) by changing a digit.
It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 18848973555 + ... + 18848975085.
It is an arithmetic number, because the mean of its divisors is an integer number (91401203520).
Almost surely, 228857779683920 is an apocalyptic number.
28857779683920 is a gapful number since it is divisible by the number (20) 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 28857779683920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58496770252800).
28857779683920 is an abundant number, since it is smaller than the sum of its proper divisors (88135760821680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
28857779683920 is a wasteful number, since it uses less digits than its factorization.
28857779683920 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2597 (or 2585 counting only the distinct ones).
The product of its (nonzero) digits is 5120962560, while the sum is 81.
The spelling of 28857779683920 in words is "twenty-eight trillion, eight hundred fifty-seven billion, seven hundred seventy-nine million, six hundred eighty-three thousand, nine hundred twenty".
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