18427978998 has 96 divisors (see below), whose sum is σ = 46969977600. Its totient is φ = 5147824320.

The previous prime is 18427978991. The next prime is 18427978999. The reversal of 18427978998 is 89987972481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427978991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2114053 + ... + 2122751.

It is an arithmetic number, because the mean of its divisors is an integer number (489270600).

Almost surely, 2^18427978998 is an apocalyptic number.

18427978998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18427978998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23484988800).

18427978998 is an abundant number, since it is smaller than the sum of its proper divisors (28541998602).

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

18427978998 is a wasteful number, since it uses less digits than its factorization.

18427978998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9554 (or 9551 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 72.

The spelling of 18427978998 in words is "eighteen billion, four hundred twenty-seven million, nine hundred seventy-eight thousand, nine hundred ninety-eight".