669390208 has 16 divisors (see below), whose sum is σ = 1333551060. Its totient is φ = 334695040.

The previous prime is 669390187. The next prime is 669390257. The reversal of 669390208 is 802093966.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2614678 + ... + 2614933.

Almost surely, 2^669390208 is an apocalyptic number.

It is an amenable number.

669390208 is a deficient number, since it is larger than the sum of its proper divisors (664160852).

669390208 is an equidigital number, since it uses as much as digits as its factorization.

669390208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5229625 (or 5229613 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 669390208 is about 25872.5763695848. The cubic root of 669390208 is about 874.7684646704.

The spelling of 669390208 in words is "six hundred sixty-nine million, three hundred ninety thousand, two hundred eight".