197731668 has 24 divisors (see below), whose sum is σ = 465609760. Its totient is φ = 65305440.

The previous prime is 197731649. The next prime is 197731693. The reversal of 197731668 is 866137791.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74278 + ... + 76893.

Almost surely, 2^197731668 is an apocalyptic number.

It is an amenable number.

197731668 is an abundant number, since it is smaller than the sum of its proper divisors (267878092).

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

197731668 is a wasteful number, since it uses less digits than its factorization.

197731668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151287 (or 151285 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 197731668 is about 14061.7092844362. The cubic root of 197731668 is about 582.5842552208.

The spelling of 197731668 in words is "one hundred ninety-seven million, seven hundred thirty-one thousand, six hundred sixty-eight".