12779664 has 40 divisors (see below), whose sum is σ = 33143712. Its totient is φ = 4243200.

The previous prime is 12779639. The next prime is 12779671. The reversal of 12779664 is 46697721.

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, 20964 + ... + 21564.

Almost surely, 2^12779664 is an apocalyptic number.

It is an amenable number.

12779664 is an abundant number, since it is smaller than the sum of its proper divisors (20364048).

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

12779664 is a wasteful number, since it uses less digits than its factorization.

12779664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055 (or 1049 counting only the distinct ones).

The product of its digits is 127008, while the sum is 42.

The square root of 12779664 is about 3574.8655918789. The cubic root of 12779664 is about 233.7974725090.

The spelling of 12779664 in words is "twelve million, seven hundred seventy-nine thousand, six hundred sixty-four".