18712012878 has 128 divisors (see below), whose sum is σ = 46061568000. Its totient is φ = 5594054400.

The previous prime is 18712012873. The next prime is 18712012901. The reversal of 18712012878 is 87821021781.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18712012873) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7798723 + ... + 7801121.

It is an arithmetic number, because the mean of its divisors is an integer number (359856000).

Almost surely, 2^18712012878 is an apocalyptic number.

18712012878 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 18712012878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23030784000).

18712012878 is an abundant number, since it is smaller than the sum of its proper divisors (27349555122).

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

18712012878 is a wasteful number, since it uses less digits than its factorization.

18712012878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2729 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 45.

The spelling of 18712012878 in words is "eighteen billion, seven hundred twelve million, twelve thousand, eight hundred seventy-eight".