18897341784 has 64 divisors (see below), whose sum is σ = 49987747200. Its totient is φ = 5936633856.

The previous prime is 18897341741. The next prime is 18897341791. The reversal of 18897341784 is 48714379881.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19354 + ... + 195369.

It is an arithmetic number, because the mean of its divisors is an integer number (781058550).

Almost surely, 2^18897341784 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 18897341784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24993873600).

18897341784 is an abundant number, since it is smaller than the sum of its proper divisors (31090405416).

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

18897341784 is a wasteful number, since it uses less digits than its factorization.

18897341784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214944 (or 214940 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 60.

The spelling of 18897341784 in words is "eighteen billion, eight hundred ninety-seven million, three hundred forty-one thousand, seven hundred eighty-four".