668504648 has 24 divisors (see below), whose sum is σ = 1458091350. Its totient is φ = 286501824.

The previous prime is 668504611. The next prime is 668504653. The reversal of 668504648 is 846405866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 618914884 + 49589764 = 24878^2 + 7042^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 852293 + ... + 853076.

Almost surely, 2^668504648 is an apocalyptic number.

It is an amenable number.

668504648 is an abundant number, since it is smaller than the sum of its proper divisors (789586702).

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

668504648 is a wasteful number, since it uses less digits than its factorization.

668504648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705389 (or 1705378 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The square root of 668504648 is about 25855.4568321660. The cubic root of 668504648 is about 874.3825403809.

The spelling of 668504648 in words is "six hundred sixty-eight million, five hundred four thousand, six hundred forty-eight".