649937568 has 144 divisors (see below), whose sum is σ = 2049110784. Its totient is φ = 179665920.

The previous prime is 649937567. The next prime is 649937609. The reversal of 649937568 is 865739946.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (649937567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143596 + ... + 148052.

It is an arithmetic number, because the mean of its divisors is an integer number (14229936).

Almost surely, 2^649937568 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 649937568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024555392).

649937568 is an abundant number, since it is smaller than the sum of its proper divisors (1399173216).

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

649937568 is a wasteful number, since it uses less digits than its factorization.

649937568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515 (or 4500 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 57.

The square root of 649937568 is about 25493.8731463071. The cubic root of 649937568 is about 866.2113705863.

The spelling of 649937568 in words is "six hundred forty-nine million, nine hundred thirty-seven thousand, five hundred sixty-eight".