18320616 has 48 divisors (see below), whose sum is σ = 50565060. Its totient is φ = 5990400.

The previous prime is 18320609. The next prime is 18320629. The reversal of 18320616 is 61602381.

18320616 is a `hidden beast` number, since 18 + 32 + 0 + 616 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17892900 + 427716 = 4230^2 + 654^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18320616.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1416 + ... + 6216.

Almost surely, 2^18320616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18320616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25282530).

18320616 is an abundant number, since it is smaller than the sum of its proper divisors (32244444).

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

18320616 is a wasteful number, since it uses less digits than its factorization.

18320616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4866 (or 4859 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18320616 is about 4280.2588706759. The cubic root of 18320616 is about 263.6210126759.

Adding to 18320616 its reverse (61602381), we get a palindrome (79922997).

The spelling of 18320616 in words is "eighteen million, three hundred twenty thousand, six hundred sixteen".