669673878 has 16 divisors (see below), whose sum is σ = 1375546800. Its totient is φ = 217191456.

The previous prime is 669673847. The next prime is 669673883. The reversal of 669673878 is 878376966.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1508053 + ... + 1508496.

It is an arithmetic number, because the mean of its divisors is an integer number (85971675).

Almost surely, 2^669673878 is an apocalyptic number.

669673878 is an abundant number, since it is smaller than the sum of its proper divisors (705872922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669673878 is a wasteful number, since it uses less digits than its factorization.

669673878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016591.

The product of its digits is 18289152, while the sum is 60.

The square root of 669673878 is about 25878.0578483007. The cubic root of 669673878 is about 874.8920151910.

The spelling of 669673878 in words is "six hundred sixty-nine million, six hundred seventy-three thousand, eight hundred seventy-eight".