668733580 has 24 divisors (see below), whose sum is σ = 1412962992. Its totient is φ = 265851072.

The previous prime is 668733563. The next prime is 668733589. The reversal of 668733580 is 85337866.

It is a self number, because there is not a number n which added to its sum of digits gives 668733580.

It is not an unprimeable number, because it can be changed into a prime (668733589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99307 + ... + 105826.

It is an arithmetic number, because the mean of its divisors is an integer number (58873458).

Almost surely, 2^668733580 is an apocalyptic number.

It is an amenable number.

668733580 is an abundant number, since it is smaller than the sum of its proper divisors (744229412).

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

668733580 is a wasteful number, since it uses less digits than its factorization.

668733580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205305 (or 205303 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 668733580 is about 25859.8836037597. The cubic root of 668733580 is about 874.4823408827.

The spelling of 668733580 in words is "six hundred sixty-eight million, seven hundred thirty-three thousand, five hundred eighty".