1987968870 has 48 divisors (see below), whose sum is σ = 5278703040. Its totient is φ = 518844672.

The previous prime is 1987968863. The next prime is 1987968919. The reversal of 1987968870 is 788697891.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1987968798 and 1987968807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230755 + ... + 239214.

It is an arithmetic number, because the mean of its divisors is an integer number (109972980).

Almost surely, 2^1987968870 is an apocalyptic number.

1987968870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987968870 is an abundant number, since it is smaller than the sum of its proper divisors (3290734170).

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

1987968870 is a wasteful number, since it uses less digits than its factorization.

1987968870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470029 (or 470026 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The square root of 1987968870 is about 44586.6445250144. The cubic root of 1987968870 is about 1257.3895880408.

The spelling of 1987968870 in words is "one billion, nine hundred eighty-seven million, nine hundred sixty-eight thousand, eight hundred seventy".