668650828 has 12 divisors (see below), whose sum is σ = 1201764592. Its totient is φ = 325289520.

The previous prime is 668650819. The next prime is 668650841. The reversal of 668650828 is 828056866.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2258808 + ... + 2259103.

Almost surely, 2^668650828 is an apocalyptic number.

It is an amenable number.

668650828 is a deficient number, since it is larger than the sum of its proper divisors (533113764).

668650828 is a wasteful number, since it uses less digits than its factorization.

668650828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517952 (or 4517950 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The square root of 668650828 is about 25858.2835470570. The cubic root of 668650828 is about 874.4462686461.

The spelling of 668650828 in words is "six hundred sixty-eight million, six hundred fifty thousand, eight hundred twenty-eight".