648920660 has 24 divisors (see below), whose sum is σ = 1365033600. Its totient is φ = 259130144.

The previous prime is 648920633. The next prime is 648920687. The reversal of 648920660 is 66029846.

It is an interprime number because it is at equal distance from previous prime (648920633) and next prime (648920687).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15104 + ... + 39063.

It is an arithmetic number, because the mean of its divisors is an integer number (56876400).

Almost surely, 2^648920660 is an apocalyptic number.

It is an amenable number.

648920660 is an abundant number, since it is smaller than the sum of its proper divisors (716112940).

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

648920660 is a wasteful number, since it uses less digits than its factorization.

648920660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54775 (or 54773 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 648920660 is about 25473.9211744089. The cubic root of 648920660 is about 865.7593696973.

The spelling of 648920660 in words is "six hundred forty-eight million, nine hundred twenty thousand, six hundred sixty".