261560 has 32 divisors (see below), whose sum is σ = 635040. Its totient is φ = 96384.
The previous prime is 261557. The next prime is 261563. The reversal of 261560 is 65162.
It is an interprime number because it is at equal distance from previous prime (261557) and next prime (261563).
It is a Harshad number since it is a multiple of its sum of digits (20).
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261560.
It is not an unprimeable number, because it can be changed into a prime (261563) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269 + ... + 771.
It is an arithmetic number, because the mean of its divisors is an integer number (19845).
2261560 is an apocalyptic number.
261560 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 261560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317520).
261560 is an abundant number, since it is smaller than the sum of its proper divisors (373480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
261560 is a wasteful number, since it uses less digits than its factorization.
261560 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 527 (or 523 counting only the distinct ones).
The product of its (nonzero) digits is 360, while the sum is 20.
The square root of 261560 is about 511.4293695125. The cubic root of 261560 is about 63.9524386220.
The spelling of 261560 in words is "two hundred sixty-one thousand, five hundred sixty".
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