1806663204 has 66 divisors (see below), whose sum is σ = 4743084150. Its totient is φ = 602142336.

The previous prime is 1806663193. The next prime is 1806663247. The reversal of 1806663204 is 4023666081.

It can be written as a sum of positive squares in only one way, i.e., 1092170304 + 714492900 = 33048^2 + 26730^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 232372 + ... + 240020.

Almost surely, 2^1806663204 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 1806663204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371542075).

1806663204 is an abundant number, since it is smaller than the sum of its proper divisors (2936420946).

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

1806663204 is an frugal number, since it uses more digits than its factorization.

1806663204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7683 (or 7654 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1806663204 is about 42504.8609455436. The cubic root of 1806663204 is about 1217.9395490394.

The spelling of 1806663204 in words is "one billion, eight hundred six million, six hundred sixty-three thousand, two hundred four".