Base | Representation |
---|---|
bin | 110101100011… |
… | …1100001100001 |
3 | 1221211121211100 |
4 | 1223013201201 |
5 | 24142031400 |
6 | 2441505013 |
7 | 460451355 |
oct | 153074141 |
9 | 57747740 |
10 | 28080225 |
11 | 1493a0a8 |
12 | 94a2169 |
13 | 5a82224 |
14 | 3a2d465 |
15 | 26ea100 |
hex | 1ac7861 |
28080225 has 36 divisors (see below), whose sum is σ = 51669436. Its totient is φ = 14567040.
The previous prime is 28080211. The next prime is 28080229. The reversal of 28080225 is 52208082.
It can be written as a sum of positive squares in 6 ways, for example, as 4809249 + 23270976 = 2193^2 + 4824^2 .
It is not a de Polignac number, because 28080225 - 27 = 28080097 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (28080229) by changing a digit.
It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6639 + ... + 10011.
Almost surely, 228080225 is an apocalyptic number.
28080225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
It is an amenable number.
28080225 is a deficient number, since it is larger than the sum of its proper divisors (23589211).
28080225 is a wasteful number, since it uses less digits than its factorization.
28080225 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3426 (or 3418 counting only the distinct ones).
The product of its (nonzero) digits is 2560, while the sum is 27.
The square root of 28080225 is about 5299.0777499486. The cubic root of 28080225 is about 303.9486329703.
The spelling of 28080225 in words is "twenty-eight million, eighty thousand, two hundred twenty-five".
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