12687816 has 16 divisors (see below), whose sum is σ = 31719600. Its totient is φ = 4229264.

The previous prime is 12687803. The next prime is 12687821. The reversal of 12687816 is 61878621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264306 + ... + 264353.

It is an arithmetic number, because the mean of its divisors is an integer number (1982475).

Almost surely, 2^12687816 is an apocalyptic number.

It is an amenable number.

12687816 is an abundant number, since it is smaller than the sum of its proper divisors (19031784).

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

12687816 is a wasteful number, since it uses less digits than its factorization.

12687816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528668 (or 528664 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 12687816 is about 3561.9960696216. The cubic root of 12687816 is about 233.2360210993.

The spelling of 12687816 in words is "twelve million, six hundred eighty-seven thousand, eight hundred sixteen".