Base | Representation |
---|---|
bin | 110111000011… |
… | …0000011101001 |
3 | 2000022021100221 |
4 | 1232012003221 |
5 | 24342020044 |
6 | 2510330041 |
7 | 500211556 |
oct | 156060351 |
9 | 60267327 |
10 | 28860649 |
11 | 15322484 |
12 | 97b9921 |
13 | 5c9650c |
14 | 3b93a2d |
15 | 2801484 |
hex | 1b860e9 |
28860649 has 4 divisors (see below), whose sum is σ = 29146500. Its totient is φ = 28574800.
The previous prime is 28860647. The next prime is 28860661. The reversal of 28860649 is 94606882.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94606882 = 2 ⋅47303441.
It can be written as a sum of positive squares in 2 ways, for example, as 14115049 + 14745600 = 3757^2 + 3840^2 .
It is a cyclic number.
It is not a de Polignac number, because 28860649 - 21 = 28860647 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (28860647) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142774 + ... + 142975.
It is an arithmetic number, because the mean of its divisors is an integer number (7286625).
Almost surely, 228860649 is an apocalyptic number.
It is an amenable number.
28860649 is a deficient number, since it is larger than the sum of its proper divisors (285851).
28860649 is a wasteful number, since it uses less digits than its factorization.
28860649 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 285850.
The product of its (nonzero) digits is 165888, while the sum is 43.
The square root of 28860649 is about 5372.2108112024. The cubic root of 28860649 is about 306.7387883039.
The spelling of 28860649 in words is "twenty-eight million, eight hundred sixty thousand, six hundred forty-nine".
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