1987110920 has 32 divisors (see below), whose sum is σ = 4580052120. Its totient is φ = 775457280.

The previous prime is 1987110913. The next prime is 1987110949. The reversal of 1987110920 is 290117891.

It can be written as a sum of positive squares in 4 ways, for example, as 632723716 + 1354387204 = 25154^2 + 36802^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604187 + ... + 607466.

Almost surely, 2^1987110920 is an apocalyptic number.

1987110920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1987110920 is an abundant number, since it is smaller than the sum of its proper divisors (2592941200).

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

1987110920 is a wasteful number, since it uses less digits than its factorization.

1987110920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211705 (or 1211701 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 1987110920 is about 44577.0223321388. The cubic root of 1987110920 is about 1257.2086776586.

The spelling of 1987110920 in words is "one billion, nine hundred eighty-seven million, one hundred ten thousand, nine hundred twenty".