666807408 has 30 divisors (see below), whose sum is σ = 1866135024. Its totient is φ = 222269088.

The previous prime is 666807403. The next prime is 666807431. The reversal of 666807408 is 804708666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666807403) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2315160 + ... + 2315447.

Almost surely, 2^666807408 is an apocalyptic number.

It is an amenable number.

666807408 is an abundant number, since it is smaller than the sum of its proper divisors (1199327616).

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

666807408 is a wasteful number, since it uses less digits than its factorization.

666807408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630621 (or 4630612 counting only the distinct ones).

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

The square root of 666807408 is about 25822.6142750884. The cubic root of 666807408 is about 873.6419348505.

It can be divided in two parts, 66680 and 7408, that added together give a cube (74088 = 42³).

The spelling of 666807408 in words is "six hundred sixty-six million, eight hundred seven thousand, four hundred eight".