648559680 has 336 divisors, whose sum is σ = 2300264640. Its totient is φ = 154275840.

The previous prime is 648559651. The next prime is 648559687. The reversal of 648559680 is 86955846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648559687) 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 47 ways as a sum of consecutive naturals, for example, 17528622 + ... + 17528658.

Almost surely, 2^648559680 is an apocalyptic number.

648559680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648559680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150132320).

648559680 is an abundant number, since it is smaller than the sum of its proper divisors (1651704960).

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

648559680 is a wasteful number, since it uses less digits than its factorization.

648559680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 648559680 is about 25466.8349034583. The cubic root of 648559680 is about 865.5988057516.

The spelling of 648559680 in words is "six hundred forty-eight million, five hundred fifty-nine thousand, six hundred eighty".