12664660 has 36 divisors (see below), whose sum is σ = 28306908. Its totient is φ = 4743168.

The previous prime is 12664607. The next prime is 12664669. The reversal of 12664660 is 6646621.

12664660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 470596 + 12194064 = 686^2 + 3492^2 .

It is a super-4 number, since 4×12664660⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65524 + ... + 65716.

It is an arithmetic number, because the mean of its divisors is an integer number (786303).

Almost surely, 2^12664660 is an apocalyptic number.

12664660 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 12664660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14153454).

12664660 is an abundant number, since it is smaller than the sum of its proper divisors (15642248).

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

12664660 is a wasteful number, since it uses less digits than its factorization.

12664660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 12664660 is about 3558.7441605151. The cubic root of 12664660 is about 233.0940449379.

The spelling of 12664660 in words is "twelve million, six hundred sixty-four thousand, six hundred sixty".