669028450 has 24 divisors (see below), whose sum is σ = 1278028692. Its totient is φ = 260377920.

The previous prime is 669028427. The next prime is 669028457. The reversal of 669028450 is 54820966.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 322956841 + 346071609 = 17971^2 + 18603^2 .

It is not an unprimeable number, because it can be changed into a prime (669028457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178969 + ... + 182668.

Almost surely, 2^669028450 is an apocalyptic number.

669028450 is a deficient number, since it is larger than the sum of its proper divisors (609000242).

669028450 is a wasteful number, since it uses less digits than its factorization.

669028450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361686 (or 361681 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 669028450 is about 25865.5842771819. The cubic root of 669028450 is about 874.6108528068.

The spelling of 669028450 in words is "six hundred sixty-nine million, twenty-eight thousand, four hundred fifty".