1987763776 has 28 divisors (see below), whose sum is σ = 4115970432. Its totient is φ = 950668928.

The previous prime is 1987763773. The next prime is 1987763807. The reversal of 1987763776 is 6773677891.

It is not an unprimeable number, because it can be changed into a prime (1987763773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673720 + ... + 676663.

It is an arithmetic number, because the mean of its divisors is an integer number (146998944).

Almost surely, 2^1987763776 is an apocalyptic number.

1987763776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1987763776 is an abundant number, since it is smaller than the sum of its proper divisors (2128206656).

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

1987763776 is a wasteful number, since it uses less digits than its factorization.

1987763776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350418 (or 1350408 counting only the distinct ones).

The product of its digits is 18670176, while the sum is 61.

The square root of 1987763776 is about 44584.3445168817. The cubic root of 1987763776 is about 1257.3463459269.

The spelling of 1987763776 in words is "one billion, nine hundred eighty-seven million, seven hundred sixty-three thousand, seven hundred seventy-six".