646748268 has 48 divisors (see below), whose sum is σ = 1559700576. Its totient is φ = 208445440.

The previous prime is 646748261. The next prime is 646748279. The reversal of 646748268 is 862847646.

It is a self number, because there is not a number n which added to its sum of digits gives 646748268.

It is not an unprimeable number, because it can be changed into a prime (646748261) 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 15 ways as a sum of consecutive naturals, for example, 49780 + ... + 61412.

It is an arithmetic number, because the mean of its divisors is an integer number (32493762).

Almost surely, 2^646748268 is an apocalyptic number.

It is an amenable number.

646748268 is an abundant number, since it is smaller than the sum of its proper divisors (912952308).

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

646748268 is a wasteful number, since it uses less digits than its factorization.

646748268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11794 (or 11792 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 51.

The square root of 646748268 is about 25431.2458994836. The cubic root of 646748268 is about 864.7921885985.

The spelling of 646748268 in words is "six hundred forty-six million, seven hundred forty-eight thousand, two hundred sixty-eight".