18561696 has 48 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 6153728.

The previous prime is 18561691. The next prime is 18561707. The reversal of 18561696 is 69616581.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18561691) 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 7 ways as a sum of consecutive naturals, for example, 22540 + ... + 23348.

It is an arithmetic number, because the mean of its divisors is an integer number (1020600).

Almost surely, 2^18561696 is an apocalyptic number.

18561696 is a gapful number since it is divisible by the number (16) 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 18561696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24494400).

18561696 is an abundant number, since it is smaller than the sum of its proper divisors (30427104).

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

18561696 is a wasteful number, since it uses less digits than its factorization.

18561696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061 (or 1053 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 18561696 is about 4308.3286782696. The cubic root of 18561696 is about 264.7723023332.

The spelling of 18561696 in words is "eighteen million, five hundred sixty-one thousand, six hundred ninety-six".