Base | Representation |
---|---|
bin | 1001101110111… |
… | …00111000010110 |
3 | 12200121222222210 |
4 | 10313130320112 |
5 | 131400120303 |
6 | 12033534250 |
7 | 2010654204 |
oct | 467347026 |
9 | 180558883 |
10 | 81645078 |
11 | 420a5179 |
12 | 23414386 |
13 | 13bb80c8 |
14 | abb4074 |
15 | 727b203 |
hex | 4ddce16 |
81645078 has 32 divisors (see below), whose sum is σ = 172569600. Its totient is φ = 25698816.
The previous prime is 81645077. The next prime is 81645079. The reversal of 81645078 is 87054618.
It is an interprime number because it is at equal distance from previous prime (81645077) and next prime (81645079).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (81645073) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7158 + ... + 14646.
It is an arithmetic number, because the mean of its divisors is an integer number (5392800).
Almost surely, 281645078 is an apocalyptic number.
81645078 is an abundant number, since it is smaller than the sum of its proper divisors (90924522).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81645078 is a wasteful number, since it uses less digits than its factorization.
81645078 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7596.
The product of its (nonzero) digits is 53760, while the sum is 39.
The square root of 81645078 is about 9035.7665972512. The cubic root of 81645078 is about 433.8204322725.
The spelling of 81645078 in words is "eighty-one million, six hundred forty-five thousand, seventy-eight".
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