647646064 has 20 divisors (see below), whose sum is σ = 1351338856. Its totient is φ = 298913472.

The previous prime is 647646049. The next prime is 647646119. The reversal of 647646064 is 460646746.

It is a self number, because there is not a number n which added to its sum of digits gives 647646064.

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, 1556634 + ... + 1557049.

Almost surely, 2^647646064 is an apocalyptic number.

It is an amenable number.

647646064 is an abundant number, since it is smaller than the sum of its proper divisors (703692792).

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

647646064 is a wasteful number, since it uses less digits than its factorization.

647646064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113704 (or 3113698 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 43.

The square root of 647646064 is about 25448.8912135676. The cubic root of 647646064 is about 865.1921628603.

The spelling of 647646064 in words is "six hundred forty-seven million, six hundred forty-six thousand, sixty-four".