648986 has 16 divisors (see below), whose sum is σ = 1062600. Its totient is φ = 295488.

The previous prime is 648971. The next prime is 648997. The reversal of 648986 is 689846.

It can be written as a sum of positive squares in 4 ways, for example, as 616225 + 32761 = 785^2 + 181^2 .

It is a Curzon number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 2720 + ... + 2948.

2⁶⁴⁸⁹⁸⁶ is an apocalyptic number.

648986 is a deficient number, since it is larger than the sum of its proper divisors (413614).

648986 is a wasteful number, since it uses less digits than its factorization.

648986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its digits is 82944, while the sum is 41.

The square root of 648986 is about 805.5966732801. The cubic root of 648986 is about 86.5788426572.

The spelling of 648986 in words is "six hundred forty-eight thousand, nine hundred eighty-six".