18778182720 has 224 divisors, whose sum is σ = 65140246656. Its totient is φ = 4545331200.

The previous prime is 18778182719. The next prime is 18778182749. The reversal of 18778182720 is 2728187781.

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 31 ways as a sum of consecutive naturals, for example, 11583510 + ... + 11585130.

Almost surely, 2^18778182720 is an apocalyptic number.

18778182720 is a gapful number since it is divisible by the number (10) 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 18778182720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32570123328).

18778182720 is an abundant number, since it is smaller than the sum of its proper divisors (46362063936).

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

18778182720 is a wasteful number, since it uses less digits than its factorization.

18778182720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749 (or 2739 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 51.

The spelling of 18778182720 in words is "eighteen billion, seven hundred seventy-eight million, one hundred eighty-two thousand, seven hundred twenty".