668491192 has 32 divisors (see below), whose sum is σ = 1315094400. Its totient is φ = 318153600.

The previous prime is 668491157. The next prime is 668491249. The reversal of 668491192 is 291194866.

It is a happy number.

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, 6967 + ... + 37222.

It is an arithmetic number, because the mean of its divisors is an integer number (41096700).

Almost surely, 2^668491192 is an apocalyptic number.

668491192 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

668491192 is a deficient number, since it is larger than the sum of its proper divisors (646603208).

668491192 is a wasteful number, since it uses less digits than its factorization.

668491192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44287 (or 44283 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 668491192 is about 25855.1966149941. The cubic root of 668491192 is about 874.3766736701.

The spelling of 668491192 in words is "six hundred sixty-eight million, four hundred ninety-one thousand, one hundred ninety-two".