666887408 has 40 divisors (see below), whose sum is σ = 1447667760. Its totient is φ = 294935040.

The previous prime is 666887399. The next prime is 666887411. The reversal of 666887408 is 804788666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 666887408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44693 + ... + 57716.

It is an arithmetic number, because the mean of its divisors is an integer number (36191694).

Almost surely, 2^666887408 is an apocalyptic number.

It is an amenable number.

666887408 is an abundant number, since it is smaller than the sum of its proper divisors (780780352).

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

666887408 is a wasteful number, since it uses less digits than its factorization.

666887408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102465 (or 102459 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 53.

The square root of 666887408 is about 25824.1632584678. The cubic root of 666887408 is about 873.6768717549.

The spelling of 666887408 in words is "six hundred sixty-six million, eight hundred eighty-seven thousand, four hundred eight".