18722407780 has 12 divisors (see below), whose sum is σ = 39317056380. Its totient is φ = 7488963104.

The previous prime is 18722407771. The next prime is 18722407811. The reversal of 18722407780 is 8770422781.

It can be written as a sum of positive squares in 2 ways, for example, as 2640109924 + 16082297856 = 51382^2 + 126816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18722407780.

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 3 ways as a sum of consecutive naturals, for example, 468060175 + ... + 468060214.

It is an arithmetic number, because the mean of its divisors is an integer number (3276421365).

Almost surely, 2^18722407780 is an apocalyptic number.

18722407780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18722407780 is an abundant number, since it is smaller than the sum of its proper divisors (20594648600).

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

18722407780 is a wasteful number, since it uses less digits than its factorization.

18722407780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936120398 (or 936120396 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 46.

The spelling of 18722407780 in words is "eighteen billion, seven hundred twenty-two million, four hundred seven thousand, seven hundred eighty".