1987638996 has 48 divisors (see below), whose sum is σ = 5304789504. Its totient is φ = 567423456.

The previous prime is 1987638953. The next prime is 1987639021. The reversal of 1987638996 is 6998367891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98551 + ... + 116993.

It is an arithmetic number, because the mean of its divisors is an integer number (110516448).

Almost surely, 2^1987638996 is an apocalyptic number.

It is an amenable number.

1987638996 is an abundant number, since it is smaller than the sum of its proper divisors (3317150508).

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

1987638996 is a wasteful number, since it uses less digits than its factorization.

1987638996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19740 (or 19738 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 66.

The square root of 1987638996 is about 44582.9451247896. The cubic root of 1987638996 is about 1257.3200357986.

The spelling of 1987638996 in words is "one billion, nine hundred eighty-seven million, six hundred thirty-eight thousand, nine hundred ninety-six".