Base | Representation |
---|---|
bin | 101001011111… |
… | …0110001000000 |
3 | 1111221011100211 |
4 | 1102332301000 |
5 | 21032043041 |
6 | 2054123504 |
7 | 352616344 |
oct | 122766100 |
9 | 44834324 |
10 | 21752896 |
11 | 11308300 |
12 | 7350594 |
13 | 4678249 |
14 | 2c63624 |
15 | 1d9a481 |
hex | 14bec40 |
21752896 has 63 divisors (see below), whose sum is σ = 48358933. Its totient is φ = 9701120.
The previous prime is 21752893. The next prime is 21752921. The reversal of 21752896 is 69825712.
The square root of 21752896 is 4664.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 15681600 + 6071296 = 3960^2 + 2464^2 .
It is a Duffinian number.
Its product of digits (60480) is a multiple of the sum of its prime factors (140).
It is not an unprimeable number, because it can be changed into a prime (21752893) by changing a digit.
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 8 ways as a sum of consecutive naturals, for example, 410406 + ... + 410458.
Almost surely, 221752896 is an apocalyptic number.
21752896 is the 4664-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21752896
21752896 is an abundant number, since it is smaller than the sum of its proper divisors (26606037).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21752896 is an equidigital number, since it uses as much as digits as its factorization.
21752896 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 140 (or 66 counting only the distinct ones).
The product of its digits is 60480, while the sum is 40.
The cubic root of 21752896 is about 279.1508970771.
The spelling of 21752896 in words is "twenty-one million, seven hundred fifty-two thousand, eight hundred ninety-six".
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