1820117604 has 72 divisors (see below), whose sum is σ = 4593173760. Its totient is φ = 560259392.

The previous prime is 1820117599. The next prime is 1820117617. The reversal of 1820117604 is 4067110281.

1820117604 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179149 + ... + 189035.

It is an arithmetic number, because the mean of its divisors is an integer number (63794080).

Almost surely, 2^1820117604 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 1820117604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2296586880).

1820117604 is an abundant number, since it is smaller than the sum of its proper divisors (2773056156).

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

1820117604 is a wasteful number, since it uses less digits than its factorization.

1820117604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9969 (or 9944 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 1820117604 is about 42662.8363332772. The cubic root of 1820117604 is about 1220.9554470104.

Adding to 1820117604 its reverse (4067110281), we get a palindrome (5887227885).

The spelling of 1820117604 in words is "one billion, eight hundred twenty million, one hundred seventeen thousand, six hundred four".