18717428736 has 132 divisors (see below), whose sum is σ = 54854638072. Its totient is φ = 6145818624.

The previous prime is 18717428729. The next prime is 18717428759. The reversal of 18717428736 is 63782471781.

18717428736 is a `hidden beast` number, since 187 + 1 + 7 + 428 + 7 + 36 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 602316 + ... + 632628.

Almost surely, 2^18717428736 is an apocalyptic number.

18717428736 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 18717428736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27427319036).

18717428736 is an abundant number, since it is smaller than the sum of its proper divisors (36137209336).

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

18717428736 is a wasteful number, since it uses less digits than its factorization.

18717428736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30406 (or 30385 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The spelling of 18717428736 in words is "eighteen billion, seven hundred seventeen million, four hundred twenty-eight thousand, seven hundred thirty-six".