646468536 has 128 divisors (see below), whose sum is σ = 1909670400. Its totient is φ = 178536960.

The previous prime is 646468531. The next prime is 646468553. The reversal of 646468536 is 635864646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646468531) 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 31 ways as a sum of consecutive naturals, for example, 787006 + ... + 787826.

It is an arithmetic number, because the mean of its divisors is an integer number (14919300).

Almost surely, 2^646468536 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 646468536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (954835200).

646468536 is an abundant number, since it is smaller than the sum of its proper divisors (1263201864).

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

646468536 is a wasteful number, since it uses less digits than its factorization.

646468536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989 (or 985 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 48.

The square root of 646468536 is about 25425.7455347921. The cubic root of 646468536 is about 864.6674904504.

The spelling of 646468536 in words is "six hundred forty-six million, four hundred sixty-eight thousand, five hundred thirty-six".