646410064 has 20 divisors (see below), whose sum is σ = 1253785204. Its totient is φ = 322852608.

The previous prime is 646410019. The next prime is 646410097. The reversal of 646410064 is 460014646.

646410064 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 134745664 + 511664400 = 11608^2 + 22620^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6567 + ... + 36550.

Almost surely, 2^646410064 is an apocalyptic number.

It is an amenable number.

646410064 is a deficient number, since it is larger than the sum of its proper divisors (607375140).

646410064 is a wasteful number, since it uses less digits than its factorization.

646410064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44062 (or 44056 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 646410064 is about 25424.5956506687. The cubic root of 646410064 is about 864.6414204207.

The spelling of 646410064 in words is "six hundred forty-six million, four hundred ten thousand, sixty-four".