18705371328 has 504 divisors, whose sum is σ = 65046758400. Its totient is φ = 5120510976.

The previous prime is 18705371317. The next prime is 18705371353. The reversal of 18705371328 is 82317350781.

18705371328 is a `hidden beast` number, since 1 + 87 + 0 + 537 + 1 + 32 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 78265033 + ... + 78265271.

Almost surely, 2^18705371328 is an apocalyptic number.

18705371328 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 18705371328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32523379200).

18705371328 is an abundant number, since it is smaller than the sum of its proper divisors (46341387072).

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

18705371328 is a wasteful number, since it uses less digits than its factorization.

18705371328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 18705371328 in words is "eighteen billion, seven hundred five million, three hundred seventy-one thousand, three hundred twenty-eight".