Base | Representation |
---|---|
bin | 110011010010… |
… | …101000001000 |
3 | 221022002221200 |
4 | 303102220020 |
5 | 11420230030 |
6 | 1200104200 |
7 | 222200055 |
oct | 63225010 |
9 | 27262850 |
10 | 13445640 |
11 | 76539aa |
12 | 4605060 |
13 | 2a2a000 |
14 | 1b0002c |
15 | 12a8d60 |
hex | cd2a08 |
13445640 has 192 divisors, whose sum is σ = 50122800. Its totient is φ = 3115008.
The previous prime is 13445633. The next prime is 13445659. The reversal of 13445640 is 4654431.
13445640 is a `hidden beast` number, since 13 + 4 + 4 + 5 + 640 = 666.
It can be written as a sum of positive squares in 8 ways, for example, as 181476 + 13264164 = 426^2 + 3642^2 .
It is a zygodrome in base 7.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 790912 + ... + 790928.
Almost surely, 213445640 is an apocalyptic number.
13445640 is a gapful number since it is divisible by the number (10) 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 13445640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25061400).
13445640 is an abundant number, since it is smaller than the sum of its proper divisors (36677160).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13445640 is a wasteful number, since it uses less digits than its factorization.
13445640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 73 (or 40 counting only the distinct ones).
The product of its (nonzero) digits is 5760, while the sum is 27.
The square root of 13445640 is about 3666.8296933455. The cubic root of 13445640 is about 237.7901311180.
The spelling of 13445640 in words is "thirteen million, four hundred forty-five thousand, six hundred forty".
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