266640 has 80 divisors (see below), whose sum is σ = 910656. Its totient is φ = 64000.
The previous prime is 266633. The next prime is 266641. The reversal of 266640 is 46662.
It is a tau number, because it is divible by the number of its divisors (80).
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a self number, because there is not a number n which added to its sum of digits gives 266640.
It is not an unprimeable number, because it can be changed into a prime (266641) by changing a digit.
266640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
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 15 ways as a sum of consecutive naturals, for example, 2590 + ... + 2690.
2266640 is an apocalyptic number.
266640 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 266640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455328).
266640 is an abundant number, since it is smaller than the sum of its proper divisors (644016).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
266640 is a wasteful number, since it uses less digits than its factorization.
266640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 128 (or 122 counting only the distinct ones).
The product of its (nonzero) digits is 1728, while the sum is 24.
The square root of 266640 is about 516.3719589598. The cubic root of 266640 is about 64.3638133702.
It can be divided in two parts, 26 and 6640, that added together give a palindrome (6666).
The spelling of 266640 in words is "two hundred sixty-six thousand, six hundred forty".
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