Base | Representation |
---|---|
bin | 110110110010… |
… | …0111110101101 |
3 | 2000001101112000 |
4 | 1231210332231 |
5 | 24323201130 |
6 | 2503402513 |
7 | 466105560 |
oct | 155447655 |
9 | 60041460 |
10 | 28725165 |
11 | 1523a707 |
12 | 9753439 |
13 | 5c49951 |
14 | 3b5a4d7 |
15 | 27c6260 |
hex | 1b64fad |
28725165 has 64 divisors (see below), whose sum is σ = 59097600. Its totient is φ = 12966912.
The previous prime is 28725149. The next prime is 28725181. The reversal of 28725165 is 56152782.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (28725149) and next prime (28725181).
It is not a de Polignac number, because 28725165 - 24 = 28725149 is a prime.
It is a Curzon number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 106651 + ... + 106919.
It is an arithmetic number, because the mean of its divisors is an integer number (923400).
Almost surely, 228725165 is an apocalyptic number.
28725165 is the 3390-th heptagonal number.
It is an amenable number.
28725165 is an abundant number, since it is smaller than the sum of its proper divisors (30372435).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
28725165 is a wasteful number, since it uses less digits than its factorization.
28725165 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 403 (or 397 counting only the distinct ones).
The product of its digits is 33600, while the sum is 36.
The square root of 28725165 is about 5359.5862713460. The cubic root of 28725165 is about 306.2580483793.
It can be divided in two parts, 287 and 25165, that added together give a palindrome (25452).
The spelling of 28725165 in words is "twenty-eight million, seven hundred twenty-five thousand, one hundred sixty-five".
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