668682190 has 32 divisors (see below), whose sum is σ = 1331051616. Its totient is φ = 239823360.

The previous prime is 668682169. The next prime is 668682193. The reversal of 668682190 is 91286866.

It is a super-2 number, since 2×668682190² = 894271742446392200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668682190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668682193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33607 + ... + 49666.

It is an arithmetic number, because the mean of its divisors is an integer number (41595363).

Almost surely, 2^668682190 is an apocalyptic number.

668682190 is a deficient number, since it is larger than the sum of its proper divisors (662369426).

668682190 is a wasteful number, since it uses less digits than its factorization.

668682190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83364.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 668682190 is about 25858.8899607079. The cubic root of 668682190 is about 874.4599399346.

The spelling of 668682190 in words is "six hundred sixty-eight million, six hundred eighty-two thousand, one hundred ninety".