648686336 has 72 divisors (see below), whose sum is σ = 1324462944. Its totient is φ = 317030400.

The previous prime is 648686333. The next prime is 648686341. The reversal of 648686336 is 633686846.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (648686333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3749546 + ... + 3749718.

Almost surely, 2^648686336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648686336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662231472).

648686336 is an abundant number, since it is smaller than the sum of its proper divisors (675776608).

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

648686336 is a wasteful number, since it uses less digits than its factorization.

648686336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 423 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 50.

The square root of 648686336 is about 25469.3214672083. The cubic root of 648686336 is about 865.6551491382.

The spelling of 648686336 in words is "six hundred forty-eight million, six hundred eighty-six thousand, three hundred thirty-six".