649768 has 32 divisors (see below), whose sum is σ = 1431360. Its totient is φ = 270720.

The previous prime is 649751. The next prime is 649769. The reversal of 649768 is 867946.

It is a self number, because there is not a number n which added to its sum of digits gives 649768.

It is not an unprimeable number, because it can be changed into a prime (649769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155 + ... + 2437.

It is an arithmetic number, because the mean of its divisors is an integer number (44730).

2⁶⁴⁹⁷⁶⁸ 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 649768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (715680).

649768 is an abundant number, since it is smaller than the sum of its proper divisors (781592).

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

649768 is a wasteful number, since it uses less digits than its factorization.

649768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 333 counting only the distinct ones).

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

The square root of 649768 is about 806.0818816969. The cubic root of 649768 is about 86.6136032835.

The spelling of 649768 in words is "six hundred forty-nine thousand, seven hundred sixty-eight".