987975666 has 24 divisors (see below), whose sum is σ = 2152994220. Its totient is φ = 327420576.

The previous prime is 987975631. The next prime is 987975671. The reversal of 987975666 is 666579789.

It can be written as a sum of positive squares in 2 ways, for example, as 886550625 + 101425041 = 29775^2 + 10071^2 .

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 155521 + ... + 161748.

Almost surely, 2^987975666 is an apocalyptic number.

987975666 is an abundant number, since it is smaller than the sum of its proper divisors (1165018554).

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

987975666 is a wasteful number, since it uses less digits than its factorization.

987975666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317450 (or 317447 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The square root of 987975666 is about 31432.0802047844. The cubic root of 987975666 is about 995.9757155254.

The spelling of 987975666 in words is "nine hundred eighty-seven million, nine hundred seventy-five thousand, six hundred sixty-six".