648660880 has 40 divisors (see below), whose sum is σ = 1723586112. Its totient is φ = 222397824.

The previous prime is 648660829. The next prime is 648660907. The reversal of 648660880 is 88066846.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 648660880.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578602 + ... + 579721.

Almost surely, 2^648660880 is an apocalyptic number.

It is an amenable number.

648660880 is an abundant number, since it is smaller than the sum of its proper divisors (1074925232).

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

648660880 is a wasteful number, since it uses less digits than its factorization.

648660880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158343 (or 1158337 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 648660880 is about 25468.8217238254. The cubic root of 648660880 is about 865.6438255321.

The spelling of 648660880 in words is "six hundred forty-eight million, six hundred sixty thousand, eight hundred eighty".