669620368 has 10 divisors (see below), whose sum is σ = 1297389494. Its totient is φ = 334810176.

The previous prime is 669620359. The next prime is 669620389. The reversal of 669620368 is 863026966.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 383063184 + 286557184 = 19572^2 + 16928^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20925621 + ... + 20925652.

Almost surely, 2^669620368 is an apocalyptic number.

It is an amenable number.

669620368 is a deficient number, since it is larger than the sum of its proper divisors (627769126).

669620368 is a wasteful number, since it uses less digits than its factorization.

669620368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41851281 (or 41851275 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 669620368 is about 25877.0239401675. The cubic root of 669620368 is about 874.8687119483.

The spelling of 669620368 in words is "six hundred sixty-nine million, six hundred twenty thousand, three hundred sixty-eight".