668551072 has 24 divisors (see below), whose sum is σ = 1504240416. Its totient is φ = 286521792.

The previous prime is 668551069. The next prime is 668551127. The reversal of 668551072 is 270155866.

668551072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492078 + ... + 1492525.

It is an arithmetic number, because the mean of its divisors is an integer number (62676684).

Almost surely, 2^668551072 is an apocalyptic number.

It is an amenable number.

668551072 is an abundant number, since it is smaller than the sum of its proper divisors (835689344).

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

668551072 is a wasteful number, since it uses less digits than its factorization.

668551072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984620 (or 2984612 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 668551072 is about 25856.3545767767. The cubic root of 668551072 is about 874.4027802778.

The spelling of 668551072 in words is "six hundred sixty-eight million, five hundred fifty-one thousand, seventy-two".