649496568 has 128 divisors (see below), whose sum is σ = 1907136000. Its totient is φ = 184246272.

The previous prime is 649496537. The next prime is 649496623. The reversal of 649496568 is 865694946.

It is a happy number.

Its product of digits (11197440) is a multiple of the sum of its prime divisors (576).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2115471 + ... + 2115777.

It is an arithmetic number, because the mean of its divisors is an integer number (14899500).

Almost surely, 2^649496568 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 649496568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953568000).

649496568 is an abundant number, since it is smaller than the sum of its proper divisors (1257639432).

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

649496568 is a wasteful number, since it uses less digits than its factorization.

649496568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 576 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 57.

The square root of 649496568 is about 25485.2225417005. Note that the first 3 decimals coincide. The cubic root of 649496568 is about 866.0154104076.

It can be divided in two parts, 64949 and 6568, that added together give a palindrome (71517).

The spelling of 649496568 in words is "six hundred forty-nine million, four hundred ninety-six thousand, five hundred sixty-eight".