1816544688 has 160 divisors (see below), whose sum is σ = 5684636160. Its totient is φ = 488785920.

The previous prime is 1816544621. The next prime is 1816544699. The reversal of 1816544688 is 8864456181.

It is a self number, because there is not a number n which added to its sum of digits gives 1816544688.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397231 + ... + 401777.

It is an arithmetic number, because the mean of its divisors is an integer number (35528976).

Almost surely, 2^1816544688 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 1816544688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2842318080).

1816544688 is an abundant number, since it is smaller than the sum of its proper divisors (3868091472).

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

1816544688 is a wasteful number, since it uses less digits than its factorization.

1816544688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635 (or 4629 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 51.

The square root of 1816544688 is about 42620.9418948010. The cubic root of 1816544688 is about 1220.1560062079.

The spelling of 1816544688 in words is "one billion, eight hundred sixteen million, five hundred forty-four thousand, six hundred eighty-eight".