18630227644 has 48 divisors (see below), whose sum is σ = 38149993728. Its totient is φ = 7793993088.

The previous prime is 18630227617. The next prime is 18630227653. The reversal of 18630227644 is 44672203681.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 18630227644.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2588619 + ... + 2595805.

It is an arithmetic number, because the mean of its divisors is an integer number (794791536).

Almost surely, 2^18630227644 is an apocalyptic number.

18630227644 is a gapful number since it is divisible by the number (14) 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 18630227644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19074996864).

18630227644 is an abundant number, since it is smaller than the sum of its proper divisors (19519766084).

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

18630227644 is a wasteful number, since it uses less digits than its factorization.

18630227644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394 (or 9392 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 18630227644 in words is "eighteen billion, six hundred thirty million, two hundred twenty-seven thousand, six hundred forty-four".