12664690 has 8 divisors (see below), whose sum is σ = 22796460. Its totient is φ = 5065872.

The previous prime is 12664681. The next prime is 12664699. The reversal of 12664690 is 9646621.

It is an interprime number because it is at equal distance from previous prime (12664681) and next prime (12664699).

It can be written as a sum of positive squares in 2 ways, for example, as 12159169 + 505521 = 3487^2 + 711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12664690² = 320788745592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12664699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633225 + ... + 633244.

Almost surely, 2^12664690 is an apocalyptic number.

12664690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12664690 is a deficient number, since it is larger than the sum of its proper divisors (10131770).

12664690 is a wasteful number, since it uses less digits than its factorization.

12664690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266476.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 12664690 is about 3558.7483754826. The cubic root of 12664690 is about 233.0942289885.

It can be divided in two parts, 126646 and 90, that added together give a square (126736 = 356²).

The spelling of 12664690 in words is "twelve million, six hundred sixty-four thousand, six hundred ninety".