18689352738 has 24 divisors (see below), whose sum is σ = 43481351952. Its totient is φ = 5339814984.

The previous prime is 18689352733. The next prime is 18689352739. The reversal of 18689352738 is 83725398681.

It is not an unprimeable number, because it can be changed into a prime (18689352733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31784320 + ... + 31784907.

It is an arithmetic number, because the mean of its divisors is an integer number (1811722998).

Almost surely, 2^18689352738 is an apocalyptic number.

18689352738 is an abundant number, since it is smaller than the sum of its proper divisors (24791999214).

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

18689352738 is a wasteful number, since it uses less digits than its factorization.

18689352738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63569246 (or 63569239 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 60.

The spelling of 18689352738 in words is "eighteen billion, six hundred eighty-nine million, three hundred fifty-two thousand, seven hundred thirty-eight".