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1666680 = 2335171943
BaseRepresentation
bin110010110111001111000
310010200020220
412112321320
5411313210
655420040
720111061
oct6267170
93120226
101666680
11a39224
12684620
13464802
14315568
1522dc70
hex196e78

1666680 has 128 divisors (see below), whose sum is σ = 5702400. Its totient is φ = 387072.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666680 is 866661.

It is a Cunningham number, because it is equal to 12912-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38739 + ... + 38781.

It is an arithmetic number, because the mean of its divisors is an integer number (44550).

21666680 is an apocalyptic number.

1666680 is a gapful number since it is divisible by the number (10) 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 1666680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2851200).

1666680 is an abundant number, since it is smaller than the sum of its proper divisors (4035720).

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

1666680 is a wasteful number, since it uses less digits than its factorization.

1666680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1666680 is about 1290.9996127033. Note that the first 3 decimals coincide. The cubic root of 1666680 is about 118.5634263171.

It can be divided in two parts, 1666 and 680, that added together give a triangular number (2346 = T68).

The spelling of 1666680 in words is "one million, six hundred sixty-six thousand, six hundred eighty".

Divisors: 1 2 3 4 5 6 8 10 12 15 17 19 20 24 30 34 38 40 43 51 57 60 68 76 85 86 95 102 114 120 129 136 152 170 172 190 204 215 228 255 258 285 323 340 344 380 408 430 456 510 516 570 645 646 680 731 760 817 860 969 1020 1032 1140 1290 1292 1462 1615 1634 1720 1938 2040 2193 2280 2451 2580 2584 2924 3230 3268 3655 3876 4085 4386 4845 4902 5160 5848 6460 6536 7310 7752 8170 8772 9690 9804 10965 12255 12920 13889 14620 16340 17544 19380 19608 21930 24510 27778 29240 32680 38760 41667 43860 49020 55556 69445 83334 87720 98040 111112 138890 166668 208335 277780 333336 416670 555560 833340 1666680