649568 has 24 divisors (see below), whose sum is σ = 1306368. Its totient is φ = 317824.

The previous prime is 649567. The next prime is 649573. The reversal of 649568 is 865946.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505 + ... + 1887.

It is an arithmetic number, because the mean of its divisors is an integer number (54432).

2⁶⁴⁹⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653184).

649568 is an abundant number, since it is smaller than the sum of its proper divisors (656800).

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

649568 is a wasteful number, since it uses less digits than its factorization.

649568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 438 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 649568 is about 805.9578152732. The cubic root of 649568 is about 86.6047157532.

The spelling of 649568 in words is "six hundred forty-nine thousand, five hundred sixty-eight".