667806408 has 48 divisors (see below), whose sum is σ = 1820193180. Its totient is φ = 221180544.

The previous prime is 667806397. The next prime is 667806431. The reversal of 667806408 is 804608766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 619113924 + 48692484 = 24882^2 + 6978^2 .

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 11 ways as a sum of consecutive naturals, for example, 18235 + ... + 40842.

Almost surely, 2^667806408 is an apocalyptic number.

It is an amenable number.

667806408 is an abundant number, since it is smaller than the sum of its proper divisors (1152386772).

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

667806408 is a wasteful number, since it uses less digits than its factorization.

667806408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59246 (or 59239 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 667806408 is about 25841.9505455761. The cubic root of 667806408 is about 874.0780091898.

The spelling of 667806408 in words is "six hundred sixty-seven million, eight hundred six thousand, four hundred eight".