649642968 has 96 divisors (see below), whose sum is σ = 1938977040. Its totient is φ = 195229440.

The previous prime is 649642967. The next prime is 649643021. The reversal of 649642968 is 869246946.

649642968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649642967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32178 + ... + 48318.

Almost surely, 2^649642968 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 649642968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969488520).

649642968 is an abundant number, since it is smaller than the sum of its proper divisors (1289334072).

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

649642968 is a wasteful number, since it uses less digits than its factorization.

649642968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16209 (or 16202 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 649642968 is about 25488.0946325927. The cubic root of 649642968 is about 866.0804736877.

The spelling of 649642968 in words is "six hundred forty-nine million, six hundred forty-two thousand, nine hundred sixty-eight".