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BaseRepresentation
bin10100010110010011100
31020212122120
42202302130
5132314110
622142540
75444652
oct2426234
91225576
10666780
11415a64
12281a50
131a465a
14134dd2
15d2870
hexa2c9c

666780 has 24 divisors (see below), whose sum is σ = 1867152. Its totient is φ = 177792.

The previous prime is 666773. The next prime is 666811. The reversal of 666780 is 87666.

Adding to 666780 its product of nonzero digits (12096), we get a palindrome (678876).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

666780 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 7 ways as a sum of consecutive naturals, for example, 5497 + ... + 5616.

It is an arithmetic number, because the mean of its divisors is an integer number (77798).

2666780 is an apocalyptic number.

666780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666780 is an abundant number, since it is smaller than the sum of its proper divisors (1200372).

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

666780 is a wasteful number, since it uses less digits than its factorization.

666780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11125 (or 11123 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 666780 is about 816.5659801878. The cubic root of 666780 is about 87.3629964824.

The spelling of 666780 in words is "six hundred sixty-six thousand, seven hundred eighty".