666879930 has 24 divisors (see below), whose sum is σ = 1733888052. Its totient is φ = 177834624.

The previous prime is 666879929. The next prime is 666879959. The reversal of 666879930 is 39978666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 663629121 + 3250809 = 25761^2 + 1803^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3704799 + ... + 3704978.

Almost surely, 2^666879930 is an apocalyptic number.

666879930 is an abundant number, since it is smaller than the sum of its proper divisors (1067008122).

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

666879930 is a wasteful number, since it uses less digits than its factorization.

666879930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7409790 (or 7409787 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 666879930 is about 25824.0184711830. The cubic root of 666879930 is about 873.6736061461.

The spelling of 666879930 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, nine hundred thirty".