18687873798 has 192 divisors, whose sum is σ = 48938722560. Its totient is φ = 5263061760.

The previous prime is 18687873767. The next prime is 18687873803. The reversal of 18687873798 is 89737878681.

18687873798 is a `hidden beast` number, since 186 + 8 + 78 + 7 + 379 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9218461 + ... + 9220487.

It is an arithmetic number, because the mean of its divisors is an integer number (254889180).

Almost surely, 2^18687873798 is an apocalyptic number.

18687873798 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 18687873798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24469361280).

18687873798 is an abundant number, since it is smaller than the sum of its proper divisors (30250848762).

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

18687873798 is a wasteful number, since it uses less digits than its factorization.

18687873798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160 (or 2143 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 72.

The spelling of 18687873798 in words is "eighteen billion, six hundred eighty-seven million, eight hundred seventy-three thousand, seven hundred ninety-eight".