18887193648 has 120 divisors (see below), whose sum is σ = 54152057856. Its totient is φ = 6142435200.

The previous prime is 18887193643. The next prime is 18887193653. The reversal of 18887193648 is 84639178881.

18887193648 is a `hidden beast` number, since 188 + 87 + 19 + 364 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (18887193643) and next prime (18887193653).

It is not an unprimeable number, because it can be changed into a prime (18887193643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2235993 + ... + 2244423.

Almost surely, 2^18887193648 is an apocalyptic number.

18887193648 is a gapful number since it is divisible by the number (18) 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 18887193648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27076028928).

18887193648 is an abundant number, since it is smaller than the sum of its proper divisors (35264864208).

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

18887193648 is a wasteful number, since it uses less digits than its factorization.

18887193648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8823 (or 8814 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 63.

The spelling of 18887193648 in words is "eighteen billion, eight hundred eighty-seven million, one hundred ninety-three thousand, six hundred forty-eight".