11681568 has 72 divisors (see below), whose sum is σ = 33965568. Its totient is φ = 3806592.

The previous prime is 11681563. The next prime is 11681569. The reversal of 11681568 is 86518611.

11681568 is a `hidden beast` number, since 1 + 16 + 81 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (11681563) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 13105 + ... + 13967.

It is an arithmetic number, because the mean of its divisors is an integer number (471744).

Almost surely, 2^11681568 is an apocalyptic number.

11681568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11681568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16982784).

11681568 is an abundant number, since it is smaller than the sum of its proper divisors (22284000).

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

11681568 is a wasteful number, since it uses less digits than its factorization.

11681568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 915 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 11681568 is about 3417.8308910770. The cubic root of 11681568 is about 226.8995913967.

The spelling of 11681568 in words is "eleven million, six hundred eighty-one thousand, five hundred sixty-eight".