11681604 has 48 divisors (see below), whose sum is σ = 33042240. Its totient is φ = 3539520.

The previous prime is 11681569. The next prime is 11681609. The reversal of 11681604 is 40618611.

11681604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11681609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3729 + ... + 6104.

It is an arithmetic number, because the mean of its divisors is an integer number (688380).

Almost surely, 2^11681604 is an apocalyptic number.

It is an amenable number.

11681604 is an abundant number, since it is smaller than the sum of its proper divisors (21360636).

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

11681604 is a wasteful number, since it uses less digits than its factorization.

11681604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9857 (or 9849 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 11681604 is about 3417.8361575710. The cubic root of 11681604 is about 226.8998244812.

It can be divided in two parts, 1168 and 1604, that added together give a palindrome (2772).

The spelling of 11681604 in words is "eleven million, six hundred eighty-one thousand, six hundred four".