660442388 has 12 divisors (see below), whose sum is σ = 1171607220. Its totient is φ = 325697472.

The previous prime is 660442373. The next prime is 660442397. The reversal of 660442388 is 883244066.

660442388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 494083984 + 166358404 = 22228^2 + 12898^2 .

It is a congruent number.

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, 1130603 + ... + 1131186.

It is an arithmetic number, because the mean of its divisors is an integer number (97633935).

Almost surely, 2^660442388 is an apocalyptic number.

It is an amenable number.

660442388 is a deficient number, since it is larger than the sum of its proper divisors (511164832).

660442388 is a wasteful number, since it uses less digits than its factorization.

660442388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261866 (or 2261864 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 660442388 is about 25699.0736798041. The cubic root of 660442388 is about 870.8532554638.

The spelling of 660442388 in words is "six hundred sixty million, four hundred forty-two thousand, three hundred eighty-eight".