18781236736 has 80 divisors (see below), whose sum is σ = 39588872400. Its totient is φ = 8876556288.

The previous prime is 18781236713. The next prime is 18781236779. The reversal of 18781236736 is 63763218781.

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 7 ways as a sum of consecutive naturals, for example, 4949656 + ... + 4953448.

It is an arithmetic number, because the mean of its divisors is an integer number (494860905).

Almost surely, 2^18781236736 is an apocalyptic number.

18781236736 is a gapful number since it is divisible by the number (16) 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 18781236736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19794436200).

18781236736 is an abundant number, since it is smaller than the sum of its proper divisors (20807635664).

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

18781236736 is an equidigital number, since it uses as much as digits as its factorization.

18781236736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4339 (or 4323 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The spelling of 18781236736 in words is "eighteen billion, seven hundred eighty-one million, two hundred thirty-six thousand, seven hundred thirty-six".