987656 has 8 divisors (see below), whose sum is σ = 1851870. Its totient is φ = 493824.

The previous prime is 987631. The next prime is 987659. The reversal of 987656 is 656789.

It is a happy number.

987656 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 448900 = 734^2 + 670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (987659) by changing a digit.

987656 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 (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61721 + ... + 61736.

2⁹⁸⁷⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

987656 is a deficient number, since it is larger than the sum of its proper divisors (864214).

987656 is a wasteful number, since it uses less digits than its factorization.

987656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123463 (or 123459 counting only the distinct ones).

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

The square root of 987656 is about 993.8088347363. The cubic root of 987656 is about 99.5868285782.

The spelling of 987656 in words is "nine hundred eighty-seven thousand, six hundred fifty-six".