649564 has 6 divisors (see below), whose sum is σ = 1136744. Its totient is φ = 324780.

The previous prime is 649559. The next prime is 649567. The reversal of 649564 is 465946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649567) by changing a digit.

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 as a sum of consecutive naturals, namely, 81192 + ... + 81199.

2⁶⁴⁹⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

649564 is a deficient number, since it is larger than the sum of its proper divisors (487180).

649564 is a wasteful number, since it uses less digits than its factorization.

649564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162395 (or 162393 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 649564 is about 805.9553337500. The cubic root of 649564 is about 86.6045379840.

The spelling of 649564 in words is "six hundred forty-nine thousand, five hundred sixty-four".