11566640 has 20 divisors (see below), whose sum is σ = 26892624. Its totient is φ = 4626624.

The previous prime is 11566619. The next prime is 11566651. The reversal of 11566640 is 4666511.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72212 + ... + 72371.

Almost surely, 2^11566640 is an apocalyptic number.

11566640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11566640 is an abundant number, since it is smaller than the sum of its proper divisors (15325984).

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

11566640 is a wasteful number, since it uses less digits than its factorization.

11566640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144596 (or 144590 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 11566640 is about 3400.9763304087. The cubic root of 11566640 is about 226.1530276410.

The spelling of 11566640 in words is "eleven million, five hundred sixty-six thousand, six hundred forty".