Base | Representation |
---|---|
bin | 1001101111110… |
… | …10010011111000 |
3 | 12200212010100110 |
4 | 10313322103320 |
5 | 131412444444 |
6 | 12040304320 |
7 | 2011665513 |
oct | 467722370 |
9 | 180763313 |
10 | 81765624 |
11 | 421777a6 |
12 | 234720a0 |
13 | 13c2ac35 |
14 | ac05d7a |
15 | 72a1cb9 |
hex | 4dfa4f8 |
81765624 has 32 divisors (see below), whose sum is σ = 206881920. Its totient is φ = 26926176.
The previous prime is 81765613. The next prime is 81765637. The reversal of 81765624 is 42656718.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18532 + ... + 22515.
It is an arithmetic number, because the mean of its divisors is an integer number (6465060).
Almost surely, 281765624 is an apocalyptic number.
It is an amenable number.
81765624 is an abundant number, since it is smaller than the sum of its proper divisors (125116296).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81765624 is a wasteful number, since it uses less digits than its factorization.
81765624 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 41139 (or 41135 counting only the distinct ones).
The product of its digits is 80640, while the sum is 39.
The square root of 81765624 is about 9042.4346279086. The cubic root of 81765624 is about 434.0338339979.
The spelling of 81765624 in words is "eighty-one million, seven hundred sixty-five thousand, six hundred twenty-four".
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