| Base | Representation |
|---|---|
| bin | 11111110100111… |
| … | …11100011100000 |
| 3 | 200121101120221200 |
| 4 | 33322133203200 |
| 5 | 1021322214330 |
| 6 | 42254321200 |
| 7 | 6421251603 |
| oct | 1772374340 |
| 9 | 617346850 |
| 10 | 266991840 |
| 11 | 127789a15 |
| 12 | 754b9200 |
| 13 | 4341184b |
| 14 | 2766033a |
| 15 | 1868da60 |
| hex | fe9f8e0 |
266991840 has 144 divisors (see below), whose sum is σ = 940657536. Its totient is φ = 68889600.
The previous prime is 266991799. The next prime is 266991841. The reversal of 266991840 is 48199662.
It is a happy number.
266991840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a tau number, because it is divible by the number of its divisors (144).
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (266991841) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41650 + ... + 47630.
It is an arithmetic number, because the mean of its divisors is an integer number (6532344).
Almost surely, 2266991840 is an apocalyptic number.
266991840 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 266991840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (470328768).
266991840 is an abundant number, since it is smaller than the sum of its proper divisors (673665696).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
266991840 is a wasteful number, since it uses less digits than its factorization.
266991840 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6033 (or 6022 counting only the distinct ones).
The product of its (nonzero) digits is 186624, while the sum is 45.
The square root of 266991840 is about 16339.8849445154. The cubic root of 266991840 is about 643.9211096347.
The spelling of 266991840 in words is "two hundred sixty-six million, nine hundred ninety-one thousand, eight hundred forty".
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