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12983680 = 27520287
BaseRepresentation
bin110001100001…
…110110000000
3220102122021001
4301201312000
511310434210
61142141344
7215234203
oct61416600
926378231
1012983680
117368916
124421854
1328c7968
141a1d93a
15121703a
hexc61d80

12983680 has 32 divisors (see below), whose sum is σ = 31040640. Its totient is φ = 5193216.

The previous prime is 12983657. The next prime is 12983681. The reversal of 12983680 is 8638921.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12983681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9504 + ... + 10783.

It is an arithmetic number, because the mean of its divisors is an integer number (970020).

Almost surely, 212983680 is an apocalyptic number.

12983680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12983680 is an abundant number, since it is smaller than the sum of its proper divisors (18056960).

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

12983680 is an equidigital number, since it uses as much as digits as its factorization.

12983680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20306 (or 20294 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 12983680 is about 3603.2873879279. The cubic root of 12983680 is about 235.0350332560.

The spelling of 12983680 in words is "twelve million, nine hundred eighty-three thousand, six hundred eighty".

Divisors: 1 2 4 5 8 10 16 20 32 40 64 80 128 160 320 640 20287 40574 81148 101435 162296 202870 324592 405740 649184 811480 1298368 1622960 2596736 3245920 6491840 12983680