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666320 = 2458329
BaseRepresentation
bin10100010101011010000
31020212000112
42202223100
5132310240
622140452
75443424
oct2425320
91225015
10666320
11415686
12281728
131a4395
14134b84
15d2665
hexa2ad0

666320 has 20 divisors (see below), whose sum is σ = 1549380. Its totient is φ = 266496.

The previous prime is 666301. The next prime is 666329. The reversal of 666320 is 23666.

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 512656 = 392^2 + 716^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666329) by changing a digit.

666320 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4085 + ... + 4244.

It is an arithmetic number, because the mean of its divisors is an integer number (77469).

2666320 is an apocalyptic number.

It is an amenable number.

666320 is an abundant number, since it is smaller than the sum of its proper divisors (883060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666320 is a wasteful number, since it uses less digits than its factorization.

666320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8342 (or 8336 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 666320 is about 816.2842642119. The cubic root of 666320 is about 87.3429017869.

Adding to 666320 its reverse (23666), we get a palindrome (689986).

The spelling of 666320 in words is "six hundred sixty-six thousand, three hundred twenty".

Divisors: 1 2 4 5 8 10 16 20 40 80 8329 16658 33316 41645 66632 83290 133264 166580 333160 666320