1816644336 has 80 divisors (see below), whose sum is σ = 5061405216. Its totient is φ = 558148608.

The previous prime is 1816644311. The next prime is 1816644367. The reversal of 1816644336 is 6334466181.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530566 + ... + 533978.

Almost surely, 2^1816644336 is an apocalyptic number.

1816644336 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 1816644336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2530702608).

1816644336 is an abundant number, since it is smaller than the sum of its proper divisors (3244760880).

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

1816644336 is a wasteful number, since it uses less digits than its factorization.

1816644336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290 (or 4284 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 1816644336 is about 42622.1108815601. The cubic root of 1816644336 is about 1220.1783166752.

The spelling of 1816644336 in words is "one billion, eight hundred sixteen million, six hundred forty-four thousand, three hundred thirty-six".