646789028 has 12 divisors (see below), whose sum is σ = 1133285580. Its totient is φ = 322993152.

The previous prime is 646789027. The next prime is 646789069. The reversal of 646789028 is 820987646.

646789028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 622602304 + 24186724 = 24952^2 + 4918^2 .

It is not an unprimeable number, because it can be changed into a prime (646789027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96701 + ... + 103172.

It is an arithmetic number, because the mean of its divisors is an integer number (94440465).

Almost surely, 2^646789028 is an apocalyptic number.

It is an amenable number.

646789028 is a deficient number, since it is larger than the sum of its proper divisors (486496552).

646789028 is a wasteful number, since it uses less digits than its factorization.

646789028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200686 (or 200684 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 646789028 is about 25432.0472632464. The cubic root of 646789028 is about 864.8103554757.

The spelling of 646789028 in words is "six hundred forty-six million, seven hundred eighty-nine thousand, twenty-eight".