12666320 has 20 divisors (see below), whose sum is σ = 29449380. Its totient is φ = 5066496.

The previous prime is 12666299. The next prime is 12666347. The reversal of 12666320 is 2366621.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 3857296 = 2968^2 + 1964^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 12666320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79085 + ... + 79244.

It is an arithmetic number, because the mean of its divisors is an integer number (1472469).

Almost surely, 2^12666320 is an apocalyptic number.

12666320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12666320 is an abundant number, since it is smaller than the sum of its proper divisors (16783060).

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

12666320 is a wasteful number, since it uses less digits than its factorization.

12666320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158342 (or 158336 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 12666320 is about 3558.9773812150. The cubic root of 12666320 is about 233.1042286357.

The spelling of 12666320 in words is "twelve million, six hundred sixty-six thousand, three hundred twenty".