1987886215820 has 24 divisors (see below), whose sum is σ = 4242996482928. Its totient is φ = 782119166400.

The previous prime is 1987886215813. The next prime is 1987886215829. The reversal of 1987886215820 is 285126887891.

It is not an unprimeable number, because it can be changed into a prime (1987886215829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 814706246 + ... + 814708685.

It is an arithmetic number, because the mean of its divisors is an integer number (176791520122).

Almost surely, 2^{1987886215820} is an apocalyptic number.

1987886215820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1987886215820 is an abundant number, since it is smaller than the sum of its proper divisors (2255110267108).

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

1987886215820 is a wasteful number, since it uses less digits than its factorization.

1987886215820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629415001 (or 1629414999 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 65.

The spelling of 1987886215820 in words is "one trillion, nine hundred eighty-seven billion, eight hundred eighty-six million, two hundred fifteen thousand, eight hundred twenty".