Base | Representation |
---|---|
bin | 110110010000… |
… | …0101111001000 |
3 | 1222112012002020 |
4 | 1230200233020 |
5 | 24240230030 |
6 | 2453404440 |
7 | 463532616 |
oct | 154405710 |
9 | 58465066 |
10 | 28445640 |
11 | 150696a3 |
12 | 9639720 |
13 | 5b7c652 |
14 | 3ac66b6 |
15 | 276d510 |
hex | 1b20bc8 |
28445640 has 64 divisors (see below), whose sum is σ = 86218560. Its totient is φ = 7507200.
The previous prime is 28445639. The next prime is 28445689. The reversal of 28445640 is 4654482.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10947 + ... + 13293.
It is an arithmetic number, because the mean of its divisors is an integer number (1347165).
Almost surely, 228445640 is an apocalyptic number.
28445640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 28445640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43109280).
28445640 is an abundant number, since it is smaller than the sum of its proper divisors (57772920).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
28445640 is a wasteful number, since it uses less digits than its factorization.
28445640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2462 (or 2458 counting only the distinct ones).
The product of its (nonzero) digits is 30720, while the sum is 33.
The square root of 28445640 is about 5333.4454154889. The cubic root of 28445640 is about 305.2614080672.
The spelling of 28445640 in words is "twenty-eight million, four hundred forty-five thousand, six hundred forty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.000 sec. • engine limits •