201280 has 56 divisors (see below), whose sum is σ = 521208. Its totient is φ = 73728.
The previous prime is 201251. The next prime is 201281. The reversal of 201280 is 82102.
It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 118336 = 288^2 + 344^2 .
It is a nialpdrome in base 8.
It is a self number, because there is not a number n which added to its sum of digits gives 201280.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (201281) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5422 + ... + 5458.
2201280 is an apocalyptic number.
201280 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 201280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260604).
201280 is an abundant number, since it is smaller than the sum of its proper divisors (319928).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
201280 is a wasteful number, since it uses less digits than its factorization.
201280 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 71 (or 61 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 13.
The square root of 201280 is about 448.6423965699. The cubic root of 201280 is about 58.6048476461.
Adding to 201280 its reverse (82102), we get a palindrome (283382).
It can be divided in two parts, 201 and 280, that multiplied together give a triangular number (56280 = T335).
The spelling of 201280 in words is "two hundred one thousand, two hundred eighty".
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