667760816 has 20 divisors (see below), whose sum is σ = 1369892232. Its totient is φ = 314240256.

The previous prime is 667760783. The next prime is 667760831. The reversal of 667760816 is 618067766.

667760816 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, 1227230 + ... + 1227773.

Almost surely, 2^667760816 is an apocalyptic number.

It is an amenable number.

667760816 is an abundant number, since it is smaller than the sum of its proper divisors (702131416).

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

667760816 is a wasteful number, since it uses less digits than its factorization.

667760816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455028 (or 2455022 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 667760816 is about 25841.0683989652. The cubic root of 667760816 is about 874.0581172615.

The spelling of 667760816 in words is "six hundred sixty-seven million, seven hundred sixty thousand, eight hundred sixteen".