18687287881812 has 96 divisors (see below), whose sum is σ = 48526460688384. Its totient is φ = 5549624617600.

The previous prime is 18687287881693. The next prime is 18687287881837. The reversal of 18687287881812 is 21818878278681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4404783 + ... + 7535030.

It is an arithmetic number, because the mean of its divisors is an integer number (505483965504).

Almost surely, 2^{18687287881812} is an apocalyptic number.

18687287881812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18687287881812 is an abundant number, since it is smaller than the sum of its proper divisors (29839172806572).

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

18687287881812 is a wasteful number, since it uses less digits than its factorization.

18687287881812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11940069 (or 11940067 counting only the distinct ones).

The product of its digits is 308281344, while the sum is 75.

The spelling of 18687287881812 in words is "eighteen trillion, six hundred eighty-seven billion, two hundred eighty-seven million, eight hundred eighty-one thousand, eight hundred twelve".