8661987 has 12 divisors (see below), whose sum is σ = 12547080. Its totient is φ = 5758368.

The previous prime is 8661977. The next prime is 8661997. The reversal of 8661987 is 7891668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8661977) and next prime (8661997).

It is not a de Polignac number, because 8661987 - 2¹¹ = 8659939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8661977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2623 + ... + 4919.

It is an arithmetic number, because the mean of its divisors is an integer number (1045590).

Almost surely, 2^8661987 is an apocalyptic number.

8661987 is a deficient number, since it is larger than the sum of its proper divisors (3885093).

8661987 is a wasteful number, since it uses less digits than its factorization.

8661987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722 (or 2719 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 8661987 is about 2943.1253795922. The cubic root of 8661987 is about 205.3710274612.

The spelling of 8661987 in words is "eight million, six hundred sixty-one thousand, nine hundred eighty-seven".