649684 has 12 divisors (see below), whose sum is σ = 1299424. Its totient is φ = 278424.

The previous prime is 649661. The next prime is 649697. The reversal of 649684 is 486946.

649684 is an admirable number.

It is a nialpdrome in base 15.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 11574 + ... + 11629.

2⁶⁴⁹⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

649684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649684 is a wasteful number, since it uses less digits than its factorization.

649684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23214 (or 23212 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 649684 is about 806.0297761249. The cubic root of 649684 is about 86.6098707429.

The spelling of 649684 in words is "six hundred forty-nine thousand, six hundred eighty-four".