13666880 has 28 divisors (see below), whose sum is σ = 32545020. Its totient is φ = 5466624.

The previous prime is 13666879. The next prime is 13666883. The reversal of 13666880 is 8866631.

It can be written as a sum of positive squares in 2 ways, for example, as 4032064 + 9634816 = 2008^2 + 3104^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21035 + ... + 21674.

Almost surely, 2^13666880 is an apocalyptic number.

13666880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13666880 is an abundant number, since it is smaller than the sum of its proper divisors (18878140).

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

13666880 is an equidigital number, since it uses as much as digits as its factorization.

13666880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42726 (or 42716 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 13666880 is about 3696.8743554522. The cubic root of 13666880 is about 239.0872740214.

The spelling of 13666880 in words is "thirteen million, six hundred sixty-six thousand, eight hundred eighty".