18778282072 has 64 divisors (see below), whose sum is σ = 39782080800. Its totient is φ = 8231408640.

The previous prime is 18778282063. The next prime is 18778282109. The reversal of 18778282072 is 27028287781.

It is a super-2 number, since 2×18778282072² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2387298 + ... + 2395150.

Almost surely, 2^18778282072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18778282072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19891040400).

18778282072 is an abundant number, since it is smaller than the sum of its proper divisors (21003798728).

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

18778282072 is a wasteful number, since it uses less digits than its factorization.

18778282072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8836 (or 8832 counting only the distinct ones).

The product of its (nonzero) digits is 1404928, while the sum is 52.

The spelling of 18778282072 in words is "eighteen billion, seven hundred seventy-eight million, two hundred eighty-two thousand, seventy-two".