987566 has 8 divisors (see below), whose sum is σ = 1532520. Its totient is φ = 476728.

The previous prime is 987559. The next prime is 987587. The reversal of 987566 is 665789.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

987566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 8456 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (191565).

2⁹⁸⁷⁵⁶⁶ is an apocalyptic number.

987566 is a deficient number, since it is larger than the sum of its proper divisors (544954).

987566 is a wasteful number, since it uses less digits than its factorization.

987566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17058.

The product of its digits is 90720, while the sum is 41.

The square root of 987566 is about 993.7635533667. The cubic root of 987566 is about 99.5838035415.

The spelling of 987566 in words is "nine hundred eighty-seven thousand, five hundred sixty-six".