648999680 has 144 divisors (see below), whose sum is σ = 1795155264. Its totient is φ = 220200960.

The previous prime is 648999677. The next prime is 648999691. The reversal of 648999680 is 86999846.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012160 + ... + 1012800.

It is an arithmetic number, because the mean of its divisors is an integer number (12466356).

Almost surely, 2^648999680 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 648999680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897577632).

648999680 is an abundant number, since it is smaller than the sum of its proper divisors (1146155584).

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

648999680 is a wasteful number, since it uses less digits than its factorization.

648999680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 59.

The square root of 648999680 is about 25475.4721251638. The cubic root of 648999680 is about 865.7945098579.

The spelling of 648999680 in words is "six hundred forty-eight million, nine hundred ninety-nine thousand, six hundred eighty".