669690808 has 8 divisors (see below), whose sum is σ = 1255670280. Its totient is φ = 334845400.

The previous prime is 669690803. The next prime is 669690829. The reversal of 669690808 is 808096966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669690803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41855668 + ... + 41855683.

It is an arithmetic number, because the mean of its divisors is an integer number (156958785).

Almost surely, 2^669690808 is an apocalyptic number.

It is an amenable number.

669690808 is a deficient number, since it is larger than the sum of its proper divisors (585979472).

669690808 is a wasteful number, since it uses less digits than its factorization.

669690808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83711357 (or 83711353 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 669690808 is about 25878.3849573346. The cubic root of 669690808 is about 874.8993878329.

The spelling of 669690808 in words is "six hundred sixty-nine million, six hundred ninety thousand, eight hundred eight".