18784347136 has 33 divisors (see below), whose sum is σ = 37559119531. Its totient is φ = 9389980672.

The previous prime is 18784347121. The next prime is 18784347139. The reversal of 18784347136 is 63174348781.

The square root of 18784347136 is 137056.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18784347139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4383651 + ... + 4387933.

Almost surely, 2^18784347136 is an apocalyptic number.

18784347136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18784347136 is the 137056-th square number.

It is an amenable number.

18784347136 is a deficient number, since it is larger than the sum of its proper divisors (18774772395).

18784347136 is an frugal number, since it uses more digits than its factorization.

18784347136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8586 (or 4285 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 52.

The spelling of 18784347136 in words is "eighteen billion, seven hundred eighty-four million, three hundred forty-seven thousand, one hundred thirty-six".