Base | Representation |
---|---|
bin | 110101011101… |
… | …1111000101101 |
3 | 1221202012102212 |
4 | 1222323320231 |
5 | 24134020212 |
6 | 2440500205 |
7 | 460162400 |
oct | 152737055 |
9 | 57665385 |
10 | 28032557 |
11 | 14907303 |
12 | 947a665 |
13 | 5a66617 |
14 | 3a19d37 |
15 | 26dae22 |
hex | 1abbe2d |
28032557 has 6 divisors (see below), whose sum is σ = 32609358. Its totient is φ = 24027864.
The previous prime is 28032553. The next prime is 28032617. The reversal of 28032557 is 75523082.
It can be written as a sum of positive squares in only one way, i.e., 21215236 + 6817321 = 4606^2 + 2611^2 .
It is not a de Polignac number, because 28032557 - 22 = 28032553 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28032551) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285998 + ... + 286095.
It is an arithmetic number, because the mean of its divisors is an integer number (5434893).
Almost surely, 228032557 is an apocalyptic number.
It is an amenable number.
28032557 is a deficient number, since it is larger than the sum of its proper divisors (4576801).
28032557 is an equidigital number, since it uses as much as digits as its factorization.
28032557 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 572107 (or 572100 counting only the distinct ones).
The product of its (nonzero) digits is 16800, while the sum is 32.
The square root of 28032557 is about 5294.5780757299. The cubic root of 28032557 is about 303.7765447287.
The spelling of 28032557 in words is "twenty-eight million, thirty-two thousand, five hundred fifty-seven".
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