669817028 has 12 divisors (see below), whose sum is σ = 1172524332. Its totient is φ = 334810080.

The previous prime is 669817019. The next prime is 669817033. The reversal of 669817028 is 820718966.

669817028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 270536704 + 399280324 = 16448^2 + 19982^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063 + ... + 37478.

It is an arithmetic number, because the mean of its divisors is an integer number (97710361).

Almost surely, 2^669817028 is an apocalyptic number.

It is an amenable number.

669817028 is a deficient number, since it is larger than the sum of its proper divisors (502707304).

669817028 is a wasteful number, since it uses less digits than its factorization.

669817028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49222 (or 49220 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 669817028 is about 25880.8235572209. The cubic root of 669817028 is about 874.9543499449.

The spelling of 669817028 in words is "six hundred sixty-nine million, eight hundred seventeen thousand, twenty-eight".