648866688 has 32 divisors (see below), whose sum is σ = 1723553160. Its totient is φ = 216288768.

The previous prime is 648866653. The next prime is 648866707. The reversal of 648866688 is 886668846.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

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, 844495 + ... + 845262.

Almost surely, 2^648866688 is an apocalyptic number.

It is an amenable number.

648866688 is an abundant number, since it is smaller than the sum of its proper divisors (1074686472).

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

648866688 is a wasteful number, since it uses less digits than its factorization.

648866688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689774 (or 1689762 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 60.

The square root of 648866688 is about 25472.8617944667. The cubic root of 648866688 is about 865.7353667320.

The spelling of 648866688 in words is "six hundred forty-eight million, eight hundred sixty-six thousand, six hundred eighty-eight".