18783607978 has 48 divisors (see below), whose sum is σ = 29593624320. Its totient is φ = 8940365280.

The previous prime is 18783607957. The next prime is 18783608083. The reversal of 18783607978 is 87970638781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47313676 + ... + 47314072.

It is an arithmetic number, because the mean of its divisors is an integer number (616533840).

Almost surely, 2^18783607978 is an apocalyptic number.

18783607978 is a deficient number, since it is larger than the sum of its proper divisors (10810016342).

18783607978 is a wasteful number, since it uses less digits than its factorization.

18783607978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 18783607978 in words is "eighteen billion, seven hundred eighty-three million, six hundred seven thousand, nine hundred seventy-eight".