18778784346 has 48 divisors (see below), whose sum is σ = 46511285184. Its totient is φ = 5364047232.

The previous prime is 18778784317. The next prime is 18778784377. The reversal of 18778784346 is 64348787781.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 570781 + ... + 602783.

It is an arithmetic number, because the mean of its divisors is an integer number (968985108).

Almost surely, 2^18778784346 is an apocalyptic number.

18778784346 is an abundant number, since it is smaller than the sum of its proper divisors (27732500838).

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

18778784346 is a wasteful number, since it uses less digits than its factorization.

18778784346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36675 (or 36672 counting only the distinct ones).

The product of its digits is 50577408, while the sum is 63.

The spelling of 18778784346 in words is "eighteen billion, seven hundred seventy-eight million, seven hundred eighty-four thousand, three hundred forty-six".