11643656 has 16 divisors (see below), whose sum is σ = 22981200. Its totient is φ = 5515344.

The previous prime is 11643629. The next prime is 11643659. The reversal of 11643656 is 65634611.

It is a super-3 number, since 3×11643656³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (11643659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38150 + ... + 38453.

It is an arithmetic number, because the mean of its divisors is an integer number (1436325).

Almost surely, 2^11643656 is an apocalyptic number.

It is an amenable number.

11643656 is a deficient number, since it is larger than the sum of its proper divisors (11337544).

11643656 is a wasteful number, since it uses less digits than its factorization.

11643656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76628 (or 76624 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 11643656 is about 3412.2801760700. The cubic root of 11643656 is about 226.6538612527.

The spelling of 11643656 in words is "eleven million, six hundred forty-three thousand, six hundred fifty-six".