12664720 has 40 divisors (see below), whose sum is σ = 30730176. Its totient is φ = 4844928.

The previous prime is 12664699. The next prime is 12664723. The reversal of 12664720 is 2746621.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (12664723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1602 + ... + 5281.

Almost surely, 2^12664720 is an apocalyptic number.

12664720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12664720 is an abundant number, since it is smaller than the sum of its proper divisors (18065456).

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

12664720 is a wasteful number, since it uses less digits than its factorization.

12664720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6919 (or 6913 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 12664720 is about 3558.7525904451. The cubic root of 12664720 is about 233.0944130388.

It can be divided in two parts, 126 and 64720, that added together give a palindrome (64846).

The spelling of 12664720 in words is "twelve million, six hundred sixty-four thousand, seven hundred twenty".