12581664 has 24 divisors (see below), whose sum is σ = 33027120. Its totient is φ = 4193856.

The previous prime is 12581659. The next prime is 12581689. The reversal of 12581664 is 46618521.

It is a tau number, because it is divible by the number of its divisors (24).

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, 65434 + ... + 65625.

It is an arithmetic number, because the mean of its divisors is an integer number (1376130).

Almost surely, 2^12581664 is an apocalyptic number.

It is an amenable number.

12581664 is an abundant number, since it is smaller than the sum of its proper divisors (20445456).

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

12581664 is a wasteful number, since it uses less digits than its factorization.

12581664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131072 (or 131064 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 12581664 is about 3547.0641381289. The cubic root of 12581664 is about 232.5837459903.

The spelling of 12581664 in words is "twelve million, five hundred eighty-one thousand, six hundred sixty-four".