12691668 has 24 divisors (see below), whose sum is σ = 32306400. Its totient is φ = 3845920.

The previous prime is 12691649. The next prime is 12691691. The reversal of 12691668 is 86619621.

It is a super-2 number, since 2×12691668² = 322156873244448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47943 + ... + 48206.

It is an arithmetic number, because the mean of its divisors is an integer number (1346100).

Almost surely, 2^12691668 is an apocalyptic number.

It is an amenable number.

12691668 is an abundant number, since it is smaller than the sum of its proper divisors (19614732).

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

12691668 is a wasteful number, since it uses less digits than its factorization.

12691668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96167 (or 96165 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 12691668 is about 3562.5367366527. The cubic root of 12691668 is about 233.2596220681.

The spelling of 12691668 in words is "twelve million, six hundred ninety-one thousand, six hundred sixty-eight".