987664 has 10 divisors (see below), whose sum is σ = 1913630. Its totient is φ = 493824.

The previous prime is 987659. The next prime is 987697. The reversal of 987664 is 466789.

It can be written as a sum of positive squares in only one way, i.e., 984064 + 3600 = 992^2 + 60^2 .

It is a nialpdrome in base 10.

It is an unprimeable 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, 30849 + ... + 30880.

It is an arithmetic number, because the mean of its divisors is an integer number (191363).

2⁹⁸⁷⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

987664 is a deficient number, since it is larger than the sum of its proper divisors (925966).

987664 is a wasteful number, since it uses less digits than its factorization.

987664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61737 (or 61731 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 987664 is about 993.8128596471. The cubic root of 987664 is about 99.5870974614.

The spelling of 987664 in words is "nine hundred eighty-seven thousand, six hundred sixty-four".