11561688 has 24 divisors (see below), whose sum is σ = 31313100. Its totient is φ = 3853872.

The previous prime is 11561687. The next prime is 11561689. The reversal of 11561688 is 88616511.

11561688 is a `hidden beast` number, since 11 + 561 + 6 + 88 = 666.

It is an interprime number because it is at equal distance from previous prime (11561687) and next prime (11561689).

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561681) 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 5 ways as a sum of consecutive naturals, for example, 80218 + ... + 80361.

Almost surely, 2^11561688 is an apocalyptic number.

11561688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11561688 is an abundant number, since it is smaller than the sum of its proper divisors (19751412).

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

11561688 is a wasteful number, since it uses less digits than its factorization.

11561688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160591 (or 160584 counting only the distinct ones).

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

The square root of 11561688 is about 3400.2482262329. The cubic root of 11561688 is about 226.1207489023.

The spelling of 11561688 in words is "eleven million, five hundred sixty-one thousand, six hundred eighty-eight".