1987866763 has 8 divisors (see below), whose sum is σ = 2140475760. Its totient is φ = 1839221760.

The previous prime is 1987866757. The next prime is 1987866767. The reversal of 1987866763 is 3676687891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987866763 is a prime.

It is a super-2 number, since 2×1987866763² = 7903228534880196338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987866767) 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 7 ways as a sum of consecutive naturals, for example, 989958 + ... + 991963.

It is an arithmetic number, because the mean of its divisors is an integer number (267559470).

Almost surely, 2^1987866763 is an apocalyptic number.

1987866763 is a deficient number, since it is larger than the sum of its proper divisors (152608997).

1987866763 is a wasteful number, since it uses less digits than its factorization.

1987866763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981997.

The product of its digits is 18289152, while the sum is 61.

The square root of 1987866763 is about 44585.4994701192. The cubic root of 1987866763 is about 1257.3680601254.

The spelling of 1987866763 in words is "one billion, nine hundred eighty-seven million, eight hundred sixty-six thousand, seven hundred sixty-three".